CWE-670
Allowed-with-ReviewAlways-Incorrect Control Flow Implementation
Abstraction: Class · Status: Draft
The code contains a control flow path that does not reflect the algorithm that the path is intended to implement, leading to incorrect behavior any time this path is navigated.
203 vulnerabilities reference this CWE, most recent first.
GHSA-V4WR-J3W6-MXQC
Vulnerability from github – Published: 2025-03-28 22:13 – Updated: 2025-10-14 21:58Summary
Delegations are a mechanism defined by the TUF specification that allow multiple different identities to provide and sign content within a single repository. Terminating delegations and delegation priority give a TUF repository unambiguous control over how overlapping delegations are resolved. tough erroneously will not terminate a search as required, and will accept information from a lower-priority delegation that should have been ignored.
Impact
When interacting with TUF repositories that use delegations, the tough client could fetch targets owned by the incorrect role. An actor which had delegated ownership of a subset of a TUF repository could provide arbitrary contents to tough clients for targets owned by the delegating identity.
Impacted versions: < v0.20.0
Patches
A fix for this issue is available in tough version 0.20.0 and later. Customers are advised to upgrade to version 0.20.0 or later and ensure any forked or derivative code is patched to incorporate the new fixes.
Workarounds
There is no recommended work around. Customers are advised to upgrade to version 0.20.0 or the latest version.
References
If you have any questions or comments about this advisory we ask that you contact AWS/Amazon Security via our vulnerability reporting page [1] or directly via email to aws-security@amazon.com. Please do not create a public GitHub issue.
[1] Vulnerability reporting page: https://aws.amazon.com/security/vulnerability-reporting
Acknowledgement
These issues were identified by the TUF-Conformance project. We would like to thank Google for collaborating on this issue through the coordinated vulnerability disclosure process.
{
"affected": [
{
"package": {
"ecosystem": "crates.io",
"name": "tough"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.20.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2025-2886"
],
"database_specific": {
"cwe_ids": [
"CWE-670"
],
"github_reviewed": true,
"github_reviewed_at": "2025-03-28T22:13:00Z",
"nvd_published_at": "2025-03-27T23:15:35Z",
"severity": "MODERATE"
},
"details": "## Summary\n\nDelegations are a mechanism defined by the TUF specification that allow multiple different identities to provide and sign content within a single repository. Terminating delegations and delegation priority give a TUF repository unambiguous control over how overlapping delegations are resolved. tough erroneously will not terminate a search as required, and will accept information from a lower-priority delegation that should have been ignored.\n\n## Impact\n\nWhen interacting with TUF repositories that use delegations, the tough client could fetch targets owned by the incorrect role. An actor which had delegated ownership of a subset of a TUF repository could provide arbitrary contents to tough clients for targets owned by the delegating identity.\n\nImpacted versions: \u003c v0.20.0\n\n## Patches\n\nA fix for this issue is available in tough version 0.20.0 and later. Customers are advised to upgrade to version 0.20.0 or later and ensure any forked or derivative code is patched to incorporate the new fixes.\n\n## Workarounds\n\nThere is no recommended work around. Customers are advised to upgrade to version 0.20.0 or the latest version.\n\n## References\n\nIf you have any questions or comments about this advisory we ask that you contact AWS/Amazon Security via our vulnerability reporting page [1] or directly via email to [aws-security@amazon.com](mailto:aws-security@amazon.com). Please do not create a public GitHub issue.\n\n\n[1] Vulnerability reporting page: https://aws.amazon.com/security/vulnerability-reporting\n\n## Acknowledgement\n\nThese issues were identified by the [TUF-Conformance project](https://github.com/theupdateframework/tuf-conformance). We would like to thank Google for collaborating on this issue through the coordinated vulnerability disclosure process.",
"id": "GHSA-v4wr-j3w6-mxqc",
"modified": "2025-10-14T21:58:53Z",
"published": "2025-03-28T22:13:00Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/awslabs/tough/security/advisories/GHSA-v4wr-j3w6-mxqc"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-2886"
},
{
"type": "WEB",
"url": "https://github.com/awslabs/tough/commit/598111f88105a707ee68b0fa06c52da7176ea96a"
},
{
"type": "WEB",
"url": "https://aws.amazon.com/security/security-bulletins/AWS-2025-007"
},
{
"type": "PACKAGE",
"url": "https://github.com/awslabs/tough"
},
{
"type": "WEB",
"url": "https://github.com/awslabs/tough/releases/tag/tough-v0.20.0"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "tough terminating targets role delegations are not respected"
}
GHSA-V8HV-78VF-X9FR
Vulnerability from github – Published: 2022-05-24 19:21 – Updated: 2022-07-13 00:01** DISPUTED ** Styra Open Policy Agent (OPA) Gatekeeper through 3.7.0 mishandles concurrency, sometimes resulting in incorrect access control. The data replication mechanism allows policies to access the Kubernetes cluster state. During data replication, OPA/Gatekeeper does not wait for the replication to finish before processing a request, which might cause inconsistencies between the replicated resources in OPA/Gatekeeper and the resources actually present in the cluster. Inconsistency can later be reflected in a policy bypass. NOTE: the vendor disagrees that this is a vulnerability, because Kubernetes states are only eventually consistent.
{
"affected": [],
"aliases": [
"CVE-2021-43979"
],
"database_specific": {
"cwe_ids": [
"CWE-670",
"CWE-755"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2021-11-17T19:15:00Z",
"severity": "MODERATE"
},
"details": "** DISPUTED ** Styra Open Policy Agent (OPA) Gatekeeper through 3.7.0 mishandles concurrency, sometimes resulting in incorrect access control. The data replication mechanism allows policies to access the Kubernetes cluster state. During data replication, OPA/Gatekeeper does not wait for the replication to finish before processing a request, which might cause inconsistencies between the replicated resources in OPA/Gatekeeper and the resources actually present in the cluster. Inconsistency can later be reflected in a policy bypass. NOTE: the vendor disagrees that this is a vulnerability, because Kubernetes states are only eventually consistent.",
"id": "GHSA-v8hv-78vf-x9fr",
"modified": "2022-07-13T00:01:49Z",
"published": "2022-05-24T19:21:01Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-43979"
},
{
"type": "WEB",
"url": "https://github.com/hkerma/opa-gatekeeper-concurrency-issue"
},
{
"type": "WEB",
"url": "https://github.com/open-policy-agent/gatekeeper/releases"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
"type": "CVSS_V3"
}
]
}
GHSA-VGF2-GVX8-XWC3
Vulnerability from github – Published: 2025-01-14 16:34 – Updated: 2025-04-24 14:39Summary
When the Vyper Compiler uses the precompiles EcRecover (0x1) and Identity (0x4), the success flag of the call is not checked. As a consequence an attacker can provide a specific amount of gas to make these calls fail but let the overall execution continue. Then the execution result can be incorrect.
Based on EVM's rules, after the failed precompile the remaining code has only 1/64 of the pre-call-gas left (as 63/64 were forwarded and spent). Hence, only fairly simple executions can follow the failed precompile calls. Therefore, we found no significantly impacted real-world contracts.
The fix is tracked in https://github.com/vyperlang/vyper/pull/4451.
Details
The relevant precompiles
EcRecover
EcRecover is used in vyper's ecrecover built-in. As the precompile consumes 3000 gas, any execution after an out-of-gas EcRecover call has at most 47 gas left.
Identity
- The Identity precompile is used in vyper to perform memory copy operations. As its cost is variable, a variable amount of gas might be left after a failed call. The bigger the copy operation, the more gas can be left. Hence, a failed call to Identity could theoretically be followed by successful storage changes or emitted events.
- Identity is no longer used when
evm-versioncancunis used (becauseMCOPYis used instead). In 0.4.0cancunis default, in 0.3.10cancunis an option, otherwisecancunis not available. As only pre-cancunversions are relevant, we don't have to consider transient storage operations succeeding a failed call to Identity.
The other precompiles
- Calls to
Sha2,ecAdd, andecMulhave success checks and have had them for a long time. - The precompiles
modexp,ripe,blake,ecPairing, andPoint Evaluationhave no builtins in vyper.
PoC
In the following we provide concrete examples of incorrectly generated bytecode. These examples are not optimized, but rather Proof-of-Concepts. The list is also not exhaustive.
ecrecover use
- Affected versions: 0.2.0 - 0.4.0
- For older compiler versions (<=0.3.9) it behaves similarly to this older advisory. As no data is returned, the previous value of the memory word is returned to the user. Hence, any dirty bytes might be returned. Contracts with older compiler versions and
ecrecoverwere checked. - For new vyper versions, the output buffer is zeroed, so when the call fails zero is returned. This is an incorrect result, but developers should anyway check for 0 as a failure case. Hence, this is unlikely to result in issues. However, we did search for such cases.
- As mentioned above at most 47 gas is left after the failed call, hence a
returnis the most realistic scenario to be attacked.
Vulnerable Code:
@external
@view
def foo(hash: bytes32, v: uint256, r:uint256, s:uint256) -> address:
return ecrecover(hash, v, r, s)
Problematic Call:
print(
c.foo(
binascii.unhexlify(
"6c9c5e133b8aafb2ea74f524a5263495e7ae5701c7248805f7b511d973dc7055"
),
28,
78616903610408968922803823221221116251138855211764625814919875002740131251724,
37668412420813231458864536126575229553064045345107737433087067088194345044408,
)
) # Returns 0x9eE53ad38Bb67d745223a4257D7d48cE973FeB7A
print(
c.foo(
binascii.unhexlify(
"6c9c5e133b8aafb2ea74f524a5263495e7ae5701c7248805f7b511d973dc7055"
),
28,
78616903610408968922803823221221116251138855211764625814919875002740131251724,
37668412420813231458864536126575229553064045345107737433087067088194345044408,
gas=3000,
)
) # Returns 0x0000000000000000000000000000000000000000
Identity to copy Dynamic Arrays
- Affected versions: 0.3.2 - 0.3.9
- Dynamic Arrays might be copied on different occasions
- That copy operation can fail leading to incorrect accesses afterwards
Vulnerable Code:
@external
def foo() -> uint256:
a: DynArray[uint256, 4000] = [2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
b: DynArray[uint256, 4000] = a
return b[0]
Problematic Call:
print(c.foo()) # Prints 2
print(c.foo(gas=170000)) # Prints 0
Identity in ABI Encoding of Returndata
- Affected versions: 0.3.2 - 0.4.0
- Complex types such as Dynamic array with Strings inside need to be abi encoded before being returned
- In that
returnthere is a memory copy which can fail
Vulnerable Code:
@external
@view
def foo(x: String[1000000], y: String[1000000]) -> DynArray[String[1000000], 2]:
z: DynArray[String[1000000], 2] = [x, y]
# Some code
return z
Problematic Call:
calldata0 = "a"*10
calldata1 = "b"*1000000
c.foo(calldata0, calldata1) # Returns correct data
c.foo(calldata0, calldata1, gas=48_400_000) # Returns incorrect data (only first part)
Assertion based on data copied through Identity
- Affected versions: 0.2.0 - 0.4.0
- An incomplete copy operation might falsify the result of a subsequent
assert
Vulnerable Code:
@internal
def bar() -> uint256[3000]:
a: uint256[3000] = [2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 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0, 0, 0, 0, 0, 0, 0, 0, 0]
return a
@external
def foo():
s: uint256[3000] = self.bar()
assert(s[0] == 0)
Problematic Call:
try:
c.foo() # Correctly reverts
except Exception as e:
print("Correctly reverted")
try:
c.foo(gas=210000) # Incorrectly succeeds
print("Incorrectly succeeded")
except Exception:
pass
Identity used in raw_revert
- Affected versions: 0.3.8 - 0.4.0
- A copy operation might appear as part of raw_revert
- As a result the revert reason might be incorrect
Vulnerable Code:
@external
def foo(_data: Bytes[10000]):
b: Bytes[10000] = _data
raw_revert(b)
Problematic Call:
calldata = binascii.unhexlify("bb" * 10_000)
c.foo(calldata) # Has correct revert reason
c.foo(calldata, gas=4_800) # Has empty revert reason, but not out-of-gas
Identity to copy static arrays
- Affected versions: 0.2.0 - 0.4.0
- Vyper might perform a memory copy for static arrays, e.g. when moving them in and out of internal functions
- As this access is especially cheap (due to the static checks) it can also happen for smaller sizes
Vulnerable Code:
@external
def foo(x: uint256[2500]) -> uint256:
s: uint256[2500] = x
t: uint256[2500] = s
return t[0]
Problematic Call:
calldata = [2] + [0] * 2499
print(c.foo(calldata)) # Prints 2
print(c.foo(calldata, gas=74500)) # Prints 0
Identity to copy and return String or Bytes
- Affected versions: 0.20 - 0.4.0
- Multiple situations in vyper might trigger a memory copy operation, e.g. moving data in and out of internal functions
- If the target buffer is later returned, incorrect data might be returned
Vulnerable Code:
@external
@view
def foo(x: String[1000000]) -> String[1000000]:
return x
Problematic Call:
calldata = "a"*1000000
x = c.foo(calldata) # Returns calldata
y = c.foo(calldata, gas=8_000_000) # Returns empty data
Identity and accessing the length of the target data
- Affected versions: 0.3.10 - 0.4.0
- Accessing the data is fairly cheap, making it possible for smaller data copies
Vulnerable Code:
@external
@view
def foo(x: String[1000000]) -> uint256:
y: String[1000000] = x
return len(y)
Problematic Call:
calldata = "a"*1000000
x = c.foo(calldata) # Returns correct length
y = c.foo(calldata, gas=7_929_200) # Returns incorrect length
Identity to copy and return String or Bytes
- Affected versions: 0.3.10 - 0.4.0
- Multiple situations in vyper might trigger a memory copy operation, e.g. moving data in and out of internal functions
- If the target buffer is later returned, incorrect data might be returned
Vulnerable Code:
@external
@view
def foo(x: String[1000000]) -> String[1000000]:
return x
Problematic Call:
calldata = "a"*1000000
x = c.foo(calldata) # Returns calldata
y = c.foo(calldata, gas=8_000_000) # Returns empty data
Impact
A contract search was conducted and yielded no significant results.
The advisory was rated a medium because the likelihood is low, but difficult to detect by source code analysis alone, and could yield unexpected results if a contract is affected by the bug.
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c 0.4.1"
},
"package": {
"ecosystem": "PyPI",
"name": "vyper"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2025-21607"
],
"database_specific": {
"cwe_ids": [
"CWE-670",
"CWE-703"
],
"github_reviewed": true,
"github_reviewed_at": "2025-01-14T16:34:20Z",
"nvd_published_at": "2025-01-14T18:16:05Z",
"severity": "LOW"
},
"details": "### Summary\n\nWhen the Vyper Compiler uses the precompiles EcRecover (0x1) and Identity (0x4), the success flag of the call is not checked. As a consequence an attacker can provide a specific amount of gas to make these calls fail but let the overall execution continue. Then the execution result can be incorrect.\n\nBased on EVM\u0027s rules, after the failed precompile the remaining code has only 1/64 of the pre-call-gas left (as 63/64 were forwarded and spent). Hence, only fairly simple executions can follow the failed precompile calls. Therefore, we found no significantly impacted real-world contracts.\n\nThe fix is tracked in https://github.com/vyperlang/vyper/pull/4451.\n\n### Details\n\n\n#### The relevant precompiles\n\n##### EcRecover\n\nEcRecover is used in vyper\u0027s `ecrecover` built-in. As the precompile consumes 3000 gas, any execution after an out-of-gas EcRecover call has at most 47 gas left.\n\n##### Identity\n\n- The Identity precompile is used in vyper to perform memory copy operations. As its cost is variable, a variable amount of gas might be left after a failed call. The bigger the copy operation, the more gas can be left. Hence, a failed call to Identity could theoretically be followed by successful storage changes or emitted events.\n- Identity is no longer used when `evm-version` `cancun` is used (because `MCOPY` is used instead). In 0.4.0 `cancun` is default, in 0.3.10 `cancun` is an option, otherwise `cancun` is not available. As only pre-`cancun` versions are relevant, we don\u0027t have to consider transient storage operations succeeding a failed call to Identity.\n\n#### The other precompiles\n\n- Calls to `Sha2`, `ecAdd`, and `ecMul` have success checks and have had them for a long time.\n- The precompiles `modexp`, `ripe`, `blake`, `ecPairing`, and `Point Evaluation` have no builtins in vyper.\n\n\n### PoC\n\nIn the following we provide concrete examples of incorrectly generated bytecode. These examples are not optimized, but rather Proof-of-Concepts. The list is also not exhaustive.\n\n#### `ecrecover` use\n\n- Affected versions: 0.2.0 - 0.4.0 \n- For older compiler versions (\u003c=0.3.9) it behaves similarly to this [older advisory](https://github.com/vyperlang/vyper/security/advisories/GHSA-f5x6-7qgp-jhf3). As no data is returned, the previous value of the memory word is returned to the user. Hence, any dirty bytes might be returned. Contracts with older compiler versions and `ecrecover` were checked.\n- For new vyper versions, the output buffer is zeroed, so when the call fails zero is returned. This is an incorrect result, but developers should anyway check for 0 as a failure case. Hence, this is unlikely to result in issues. However, we did search for such cases.\n- As mentioned above at most 47 gas is left after the failed call, hence a `return` is the most realistic scenario to be attacked.\n\nVulnerable Code:\n```py\n@external\n@view\ndef foo(hash: bytes32, v: uint256, r:uint256, s:uint256) -\u003e address:\n return ecrecover(hash, v, r, s)\n```\n\nProblematic Call:\n```py\nprint(\n c.foo(\n binascii.unhexlify(\n \"6c9c5e133b8aafb2ea74f524a5263495e7ae5701c7248805f7b511d973dc7055\"\n ),\n 28,\n 78616903610408968922803823221221116251138855211764625814919875002740131251724,\n 37668412420813231458864536126575229553064045345107737433087067088194345044408,\n )\n) # Returns 0x9eE53ad38Bb67d745223a4257D7d48cE973FeB7A\n\nprint(\n c.foo(\n binascii.unhexlify(\n \"6c9c5e133b8aafb2ea74f524a5263495e7ae5701c7248805f7b511d973dc7055\"\n ),\n 28,\n 78616903610408968922803823221221116251138855211764625814919875002740131251724,\n 37668412420813231458864536126575229553064045345107737433087067088194345044408,\n gas=3000,\n )\n) # Returns 0x0000000000000000000000000000000000000000\n```\n\n#### Identity to copy Dynamic Arrays\n\n- Affected versions: 0.3.2 - 0.3.9\n- Dynamic Arrays might be copied on different occasions\n- That copy operation can fail leading to incorrect accesses afterwards\n\nVulnerable Code:\n```py\n\n@external\ndef foo() -\u003e uint256:\n a: DynArray[uint256, 4000] = [2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]\n b: DynArray[uint256, 4000] = a\n return b[0]\n```\n\nProblematic Call:\n```py\nprint(c.foo()) # Prints 2\nprint(c.foo(gas=170000)) # Prints 0\n```\n\n#### Identity in ABI Encoding of Returndata\n\n- Affected versions: 0.3.2 - 0.4.0\n- Complex types such as Dynamic array with Strings inside need to be abi encoded before being returned\n- In that `return` there is a memory copy which can fail\n\nVulnerable Code:\n```py\n@external\n@view\ndef foo(x: String[1000000], y: String[1000000]) -\u003e DynArray[String[1000000], 2]:\n z: DynArray[String[1000000], 2] = [x, y]\n # Some code\n return z\n```\n\nProblematic Call:\n```py\ncalldata0 = \"a\"*10\ncalldata1 = \"b\"*1000000\nc.foo(calldata0, calldata1) # Returns correct data\nc.foo(calldata0, calldata1, gas=48_400_000) # Returns incorrect data (only first part)\n```\n\n#### Assertion based on data copied through Identity\n\n- Affected versions: 0.2.0 - 0.4.0\n- An incomplete copy operation might falsify the result of a subsequent `assert`\n\n\nVulnerable Code:\n```py\n@internal\ndef bar() -\u003e uint256[3000]:\n a: uint256[3000] = [2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]\n return a\n\n@external\ndef foo():\n s: uint256[3000] = self.bar()\n assert(s[0] == 0)\n```\n\nProblematic Call:\n```py\ntry:\n c.foo() # Correctly reverts\nexcept Exception as e:\n print(\"Correctly reverted\")\ntry:\n c.foo(gas=210000) # Incorrectly succeeds\n print(\"Incorrectly succeeded\")\nexcept Exception:\n pass\n```\n\n#### Identity used in `raw_revert`\n\n- Affected versions: 0.3.8 - 0.4.0\n- A copy operation might appear as part of raw_revert\n- As a result the revert reason might be incorrect\n\nVulnerable Code:\n```py\n@external\ndef foo(_data: Bytes[10000]):\n b: Bytes[10000] = _data\n raw_revert(b)\n```\n\nProblematic Call:\n```py\ncalldata = binascii.unhexlify(\"bb\" * 10_000)\nc.foo(calldata) # Has correct revert reason\nc.foo(calldata, gas=4_800) # Has empty revert reason, but not out-of-gas\n```\n\n\n#### Identity to copy static arrays\n\n- Affected versions: 0.2.0 - 0.4.0\n- Vyper might perform a memory copy for static arrays, e.g. when moving them in and out of internal functions\n- As this access is especially cheap (due to the static checks) it can also happen for smaller sizes\n\nVulnerable Code:\n```py\n@external\ndef foo(x: uint256[2500]) -\u003e uint256:\n s: uint256[2500] = x\n t: uint256[2500] = s\n return t[0]\n```\n\nProblematic Call:\n```py\ncalldata = [2] + [0] * 2499\nprint(c.foo(calldata)) # Prints 2\nprint(c.foo(calldata, gas=74500)) # Prints 0\n```\n\n\n#### Identity to copy and return String or Bytes\n\n- Affected versions: 0.20 - 0.4.0\n- Multiple situations in vyper might trigger a memory copy operation, e.g. moving data in and out of internal functions\n- If the target buffer is later returned, incorrect data might be returned\n\nVulnerable Code:\n```py\n@external\n@view\ndef foo(x: String[1000000]) -\u003e String[1000000]:\n return x\n```\n\nProblematic Call:\n```py\ncalldata = \"a\"*1000000\nx = c.foo(calldata) # Returns calldata\ny = c.foo(calldata, gas=8_000_000) # Returns empty data\n```\n\n\n#### Identity and accessing the length of the target data\n\n- Affected versions: 0.3.10 - 0.4.0\n- Accessing the data is fairly cheap, making it possible for smaller data copies\n\nVulnerable Code:\n```py\n@external\n@view\ndef foo(x: String[1000000]) -\u003e uint256:\n y: String[1000000] = x\n return len(y)\n```\n\nProblematic Call:\n```py\ncalldata = \"a\"*1000000\nx = c.foo(calldata) # Returns correct length\ny = c.foo(calldata, gas=7_929_200) # Returns incorrect length\n```\n\n#### Identity to copy and return String or Bytes\n\n- Affected versions: 0.3.10 - 0.4.0\n- Multiple situations in vyper might trigger a memory copy operation, e.g. moving data in and out of internal functions\n- If the target buffer is later returned, incorrect data might be returned\n\nVulnerable Code:\n```py\n@external\n@view\ndef foo(x: String[1000000]) -\u003e String[1000000]:\n return x\n```\n\nProblematic Call:\n```py\ncalldata = \"a\"*1000000\nx = c.foo(calldata) # Returns calldata\ny = c.foo(calldata, gas=8_000_000) # Returns empty data\n```\n\n### Impact\n\nA contract search was conducted and yielded no significant results.\n\nThe advisory was rated a medium because the likelihood is low, but difficult to detect by source code analysis alone, and could yield unexpected results if a contract is affected by the bug.",
"id": "GHSA-vgf2-gvx8-xwc3",
"modified": "2025-04-24T14:39:58Z",
"published": "2025-01-14T16:34:20Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/vyperlang/vyper/security/advisories/GHSA-vgf2-gvx8-xwc3"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-21607"
},
{
"type": "WEB",
"url": "https://github.com/vyperlang/vyper/pull/4451"
},
{
"type": "WEB",
"url": "https://github.com/vyperlang/vyper/commit/7136eab0a254aa2ff7ddca41cc05f2ee1fa99caf"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/vyper/PYSEC-2025-33.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/vyperlang/vyper"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Vyper Does Not Check the Success of Certain Precompile Calls"
}
GHSA-VR26-JCQ5-FJJ8
Vulnerability from github – Published: 2024-09-03 20:49 – Updated: 2024-09-09 14:20Summary
As of quinn-proto 0.11, it is possible for a server to accept(), retry(), refuse(), or ignore() an Incoming connection. However, calling retry() on an unvalidated connection exposes the server to a likely panic in the following situations:
- Calling
refuseorignoreon the resulting validated connection, if a duplicate initial packet is received - This issue can go undetected until a server's
refuse()/ignore()code path is exercised, such as to stop a denial of service attack. - Accepting when the initial packet for the resulting validated connection fails to decrypt or exhausts connection IDs, if a similar initial packet that successfully decrypts and doesn't exhaust connection IDs is received.
- This issue can go undetected if clients are well-behaved.
The former situation was observed in a real application, while the latter is only theoretical.
Details
Location of panic: https://github.com/quinn-rs/quinn/blob/bb02a12a8435a7732a1d762783eeacbb7e50418e/quinn-proto/src/endpoint.rs#L213
Impact
Denial of service for internet-facing server
{
"affected": [
{
"package": {
"ecosystem": "crates.io",
"name": "quinn-proto"
},
"ranges": [
{
"events": [
{
"introduced": "0.11.0"
},
{
"fixed": "0.11.7"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2024-45311"
],
"database_specific": {
"cwe_ids": [
"CWE-670"
],
"github_reviewed": true,
"github_reviewed_at": "2024-09-03T20:49:26Z",
"nvd_published_at": "2024-09-02T18:15:37Z",
"severity": "HIGH"
},
"details": "### Summary\n\nAs of quinn-proto 0.11, it is possible for a server to `accept()`, `retry()`, `refuse()`, or `ignore()` an `Incoming` connection. However, calling `retry()` on an unvalidated connection exposes the server to a likely panic in the following situations:\n\n- Calling `refuse` or `ignore` on the resulting validated connection, if a duplicate initial packet is received\n - This issue can go undetected until a server\u0027s `refuse()`/`ignore()` code path is exercised, such as to stop a denial of service attack.\n- Accepting when the initial packet for the resulting validated connection fails to decrypt or exhausts connection IDs, if a similar initial packet that successfully decrypts and doesn\u0027t exhaust connection IDs is received.\n - This issue can go undetected if clients are well-behaved.\n\nThe former situation was observed in a real application, while the latter is only theoretical.\n\n### Details\n\nLocation of panic: https://github.com/quinn-rs/quinn/blob/bb02a12a8435a7732a1d762783eeacbb7e50418e/quinn-proto/src/endpoint.rs#L213\n\n### Impact\nDenial of service for internet-facing server",
"id": "GHSA-vr26-jcq5-fjj8",
"modified": "2024-09-09T14:20:32Z",
"published": "2024-09-03T20:49:26Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/quinn-rs/quinn/security/advisories/GHSA-vr26-jcq5-fjj8"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-45311"
},
{
"type": "WEB",
"url": "https://github.com/quinn-rs/quinn/commit/e01609ccd8738bd438d86fa7185a0f85598cb58f"
},
{
"type": "PACKAGE",
"url": "https://github.com/quinn-rs/quinn"
},
{
"type": "WEB",
"url": "https://github.com/quinn-rs/quinn/blob/bb02a12a8435a7732a1d762783eeacbb7e50418e/quinn-proto/src/endpoint.rs#L213"
},
{
"type": "WEB",
"url": "https://rustsec.org/advisories/RUSTSEC-2024-0373.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Denial of service in quinn-proto when using `Endpoint::retry()`"
}
GHSA-VW24-HHMF-XP64
Vulnerability from github – Published: 2025-11-25 18:32 – Updated: 2025-11-25 18:32NVIDIA DGX Spark GB10 contains a vulnerability in SROOT firmware, where an attacker could cause incorrect control flow behavior. A successful exploit of this vulnerability might lead to data tampering.
{
"affected": [],
"aliases": [
"CVE-2025-33199"
],
"database_specific": {
"cwe_ids": [
"CWE-670"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-11-25T18:15:51Z",
"severity": "LOW"
},
"details": "NVIDIA DGX Spark GB10 contains a vulnerability in SROOT firmware, where an attacker could cause incorrect control flow behavior. A successful exploit of this vulnerability might lead to data tampering.",
"id": "GHSA-vw24-hhmf-xp64",
"modified": "2025-11-25T18:32:23Z",
"published": "2025-11-25T18:32:23Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-33199"
},
{
"type": "WEB",
"url": "https://nvidia.custhelp.com/app/answers/detail/a_id/5720"
},
{
"type": "WEB",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-33199"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:N",
"type": "CVSS_V3"
}
]
}
GHSA-VXMM-CWH2-Q762
Vulnerability from github – Published: 2023-05-22 20:35 – Updated: 2024-11-19 16:42Impact
in contracts with at least one regular nonpayable function, due to the callvalue check being inside of the selector section, it is possible to send funds to the default function by using less than 4 bytes of calldata, even if the default function is marked nonpayable. this applies to contracts compiled with vyper<=0.3.7.
# @version 0.3.7
# implicitly nonpayable
@external
def foo() -> uint256:
return 1
# implicitly nonpayable
@external
def __default__():
# could receive ether here
pass
Patches
this was fixed by the removal of the global calldatasize check in https://github.com/vyperlang/vyper/commit/02339dfda0f3caabad142060d511d10bfe93c520.
Workarounds
don't use nonpayable default functions
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "vyper"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.3.8"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2023-32675"
],
"database_specific": {
"cwe_ids": [
"CWE-670"
],
"github_reviewed": true,
"github_reviewed_at": "2023-05-22T20:35:46Z",
"nvd_published_at": "2023-05-19T20:15:09Z",
"severity": "MODERATE"
},
"details": "### Impact\nin contracts with at least one regular nonpayable function, due to the callvalue check being inside of the selector section, it is possible to send funds to the default function by using less than 4 bytes of calldata, even if the default function is marked `nonpayable`. this applies to contracts compiled with vyper\u003c=0.3.7.\n```vyper\n# @version 0.3.7\n\n# implicitly nonpayable\n@external\ndef foo() -\u003e uint256:\n return 1\n\n# implicitly nonpayable\n@external\ndef __default__():\n # could receive ether here\n pass\n```\n\n### Patches\nthis was fixed by the removal of the global calldatasize check in https://github.com/vyperlang/vyper/commit/02339dfda0f3caabad142060d511d10bfe93c520.\n\n### Workarounds\ndon\u0027t use nonpayable default functions\n\n",
"id": "GHSA-vxmm-cwh2-q762",
"modified": "2024-11-19T16:42:42Z",
"published": "2023-05-22T20:35:46Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/vyperlang/vyper/security/advisories/GHSA-vxmm-cwh2-q762"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-32675"
},
{
"type": "WEB",
"url": "https://github.com/vyperlang/vyper/commit/02339dfda0f3caabad142060d511d10bfe93c520"
},
{
"type": "WEB",
"url": "https://github.com/vyperlang/vyper/commit/02339dfda0f3caabad142060d511d10bfe93c520."
},
{
"type": "WEB",
"url": "https://github.com/vyperlang/vyper/commit/903727006c1e5ebef99fa9fd5d51d62bd33d72a9"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/vyper/PYSEC-2023-80.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/vyperlang/vyper"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Vyper\u0027s nonpayable default functions are sometimes payable"
}
GHSA-W6WJ-G5CV-FH4W
Vulnerability from github – Published: 2023-04-11 00:30 – Updated: 2025-04-23 18:30A flaw was found in openvswitch (OVS). When processing an IP packet with protocol 0, OVS will install the datapath flow without the action modifying the IP header. This issue results (for both kernel and userspace datapath) in installing a datapath flow matching all IP protocols (nw_proto is wildcarded) for this flow, but with an incorrect action, possibly causing incorrect handling of other IP packets with a != 0 IP protocol that matches this dp flow.
{
"affected": [],
"aliases": [
"CVE-2023-1668"
],
"database_specific": {
"cwe_ids": [
"CWE-670"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2023-04-10T22:15:00Z",
"severity": "HIGH"
},
"details": "A flaw was found in openvswitch (OVS). When processing an IP packet with protocol 0, OVS will install the datapath flow without the action modifying the IP header. This issue results (for both kernel and userspace datapath) in installing a datapath flow matching all IP protocols (nw_proto is wildcarded) for this flow, but with an incorrect action, possibly causing incorrect handling of other IP packets with a != 0 IP protocol that matches this dp flow.",
"id": "GHSA-w6wj-g5cv-fh4w",
"modified": "2025-04-23T18:30:42Z",
"published": "2023-04-11T00:30:24Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-1668"
},
{
"type": "WEB",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2137666"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2023/05/msg00000.html"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/V2GUNS3WSJG4TUDKZ5L7FXGJMVOD6EJZ"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/V2GUNS3WSJG4TUDKZ5L7FXGJMVOD6EJZ"
},
{
"type": "WEB",
"url": "https://security.gentoo.org/glsa/202311-16"
},
{
"type": "WEB",
"url": "https://www.debian.org/security/2023/dsa-5387"
},
{
"type": "WEB",
"url": "https://www.openwall.com/lists/oss-security/2023/04/06/1"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-W9G2-3W7P-72G9
Vulnerability from github – Published: 2023-04-24 22:33 – Updated: 2024-11-19 16:31Background
During the audit of Lido's Gate Seals code statemind team identified a weird behavior of the code that uses raw_call: https://github.com/lidofinance/gate-seals/blob/051593e74df01a4131c485b4fda52e691cd4b7d8/contracts/GateSeal.vy#L164 .
Construction like this:
success = raw_call(
sealable,
_abi_encode(SEAL_DURATION_SECONDS, method_id=method_id("pauseFor(uint256)")),
revert_on_failure=False
)
was not fully documented: https://docs.vyperlang.org/en/v0.3.7/built-in-functions.html#raw_call .
The documentation says that: if max_outsize=0 it should return nothing and then it says that if revert_on_failure=False it should return a success flag in the tuple of response, but what if max_outsize=0 and revert_on_failure=False.

So the team started researching what exactly happened in that case, after some research we found that the Vyper compiler generates the wrong bytecode in that case, it generates the sequence:
CALL // call
MLOAD // MLOAD is wrong since the CALL result is already stored in the stack
Impact
Example of buggy code:
@external
def returnSome(calling: address, a: uint256) -> bool:
success: bool = false
success = raw_call(
calling,
_abi_encode(a, method_id=method_id("a(uint256)")),
revert_on_failure=False
)
any contract that uses the raw_call with revert_on_failure=False and max_outsize=0 receives the wrong response from raw_call. Depending on the memory garbage, the result can be either True or False.
Patches
Fix by @charles-cooper https://github.com/vyperlang/vyper/commit/851f7a1b3aa2a36fd041e3d0ed38f9355a58c8ae
Workarounds
The simple workaround is always to put max_outsize>0.
Workaround example https://github.com/lidofinance/gate-seals/pull/5/files
References
Lido's fix: https://github.com/lidofinance/gate-seals/pull/5/files
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "vyper"
},
"ranges": [
{
"events": [
{
"introduced": "0.3.1"
},
{
"fixed": "0.3.8"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2023-30629"
],
"database_specific": {
"cwe_ids": [
"CWE-670"
],
"github_reviewed": true,
"github_reviewed_at": "2023-04-24T22:33:52Z",
"nvd_published_at": "2023-04-24T22:15:10Z",
"severity": "HIGH"
},
"details": "### Background\nDuring the audit of [Lido\u0027s Gate Seals](https://github.com/lidofinance/gate-seals) code [statemind](https://statemind.io) team identified a weird behavior of the code that uses `raw_call`: https://github.com/lidofinance/gate-seals/blob/051593e74df01a4131c485b4fda52e691cd4b7d8/contracts/GateSeal.vy#L164 .\n\nConstruction like this:\n```vyper\nsuccess = raw_call(\n sealable,\n _abi_encode(SEAL_DURATION_SECONDS, method_id=method_id(\"pauseFor(uint256)\")),\n revert_on_failure=False\n)\n```\nwas not fully documented: https://docs.vyperlang.org/en/v0.3.7/built-in-functions.html#raw_call .\n\nThe documentation says that: if `max_outsize=0` it should return nothing and then it says that if `revert_on_failure=False` it should return a `success` flag in the tuple of response, but what if `max_outsize=0` and `revert_on_failure=False`.\n\n\u003cimg width=\"715\" alt=\"image\" src=\"https://user-images.githubusercontent.com/22330612/232125364-d2b3bbac-0b4f-40cb-80ff-f55d8eafef44.png\"\u003e\n\n So the team started researching what exactly happened in that case, after some research we found that the Vyper compiler generates the wrong bytecode in that case, it generates the sequence:\n```\nCALL // call\nMLOAD // MLOAD is wrong since the CALL result is already stored in the stack\n```\n\n### Impact\nExample of buggy code:\n```vyper\n@external\ndef returnSome(calling: address, a: uint256) -\u003e bool:\n success: bool = false\n success = raw_call(\n calling,\n _abi_encode(a, method_id=method_id(\"a(uint256)\")),\n revert_on_failure=False\n )\n```\n\nany contract that uses the `raw_call` with `revert_on_failure=False` and `max_outsize=0` receives the wrong response from `raw_call`. Depending on the memory garbage, the result can be either `True` or `False`.\n\n### Patches\nFix by @charles-cooper https://github.com/vyperlang/vyper/commit/851f7a1b3aa2a36fd041e3d0ed38f9355a58c8ae\n\n### Workarounds\nThe simple workaround is always to put `max_outsize\u003e0`.\nWorkaround example https://github.com/lidofinance/gate-seals/pull/5/files\n\n### References\nLido\u0027s fix: https://github.com/lidofinance/gate-seals/pull/5/files\n",
"id": "GHSA-w9g2-3w7p-72g9",
"modified": "2024-11-19T16:31:34Z",
"published": "2023-04-24T22:33:52Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/vyperlang/vyper/security/advisories/GHSA-w9g2-3w7p-72g9"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-30629"
},
{
"type": "WEB",
"url": "https://github.com/lidofinance/gate-seals/pull/5/files"
},
{
"type": "WEB",
"url": "https://github.com/vyperlang/vyper/commit/851f7a1b3aa2a36fd041e3d0ed38f9355a58c8ae"
},
{
"type": "WEB",
"url": "https://docs.vyperlang.org/en/v0.3.7/built-in-functions.html#raw_call"
},
{
"type": "WEB",
"url": "https://github.com/lidofinance/gate-seals/blob/051593e74df01a4131c485b4fda52e691cd4b7d8/contracts/GateSeal.vy#L164"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/vyper/PYSEC-2023-131.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/vyperlang/vyper"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Incorrect success value returned in vyper"
}
GHSA-WF42-42FG-FG84
Vulnerability from github – Published: 2026-03-17 18:38 – Updated: 2026-03-20 21:21Impact
In a NestJS application using @nestjs/platform-fastify, GET middleware can be bypassed because Fastify automatically redirects HEAD requests to the corresponding GET handlers (if they exist).
As a result:
- Middleware will be completely skipped.
- The HTTP response won't include a body (since the response is truncated when redirecting a HEAD request to a GET handler).
- The actual handler will still be executed.
Patches
Fixed in @nestjs/platform-fastify@11.1.16
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 11.1.15"
},
"package": {
"ecosystem": "npm",
"name": "@nestjs/platform-fastify"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "11.1.16"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-33011"
],
"database_specific": {
"cwe_ids": [
"CWE-670"
],
"github_reviewed": true,
"github_reviewed_at": "2026-03-17T18:38:38Z",
"nvd_published_at": "2026-03-20T05:16:15Z",
"severity": "HIGH"
},
"details": "### Impact\n\nIn a NestJS application using `@nestjs/platform-fastify`, GET middleware can be bypassed because Fastify automatically redirects HEAD requests to the corresponding GET handlers (if they exist).\n\nAs a result:\n\n- Middleware will be completely skipped.\n- The HTTP response won\u0027t include a body (since the response is truncated when redirecting a HEAD request to a GET handler).\n- The actual handler will still be executed.\n\n### Patches\n\nFixed in `@nestjs/platform-fastify@11.1.16`",
"id": "GHSA-wf42-42fg-fg84",
"modified": "2026-03-20T21:21:43Z",
"published": "2026-03-17T18:38:38Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/nestjs/nest/security/advisories/GHSA-wf42-42fg-fg84"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33011"
},
{
"type": "WEB",
"url": "https://github.com/nestjs/nest/commit/cbdf737cd6e7cefa52d05ecea2ae4af95c464614"
},
{
"type": "PACKAGE",
"url": "https://github.com/nestjs/nest"
},
{
"type": "WEB",
"url": "https://github.com/nestjs/nest/releases/tag/v11.1.17"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Nest Fastify HEAD Request Middleware Bypass"
}
GHSA-WG6C-HMH5-PHQ6
Vulnerability from github – Published: 2022-05-24 17:36 – Updated: 2022-05-24 17:36MediaWiki before 1.35.1 blocks legitimate attempts to hide log entries in some situations. If one sets MediaWiki:Mainpage to Special:MyLanguage/Main Page, visits a log entry on Special:Log, and toggles the "Change visibility of selected log entries" checkbox (or a tags checkbox) next to it, there is a redirection to the main page's action=historysubmit (instead of the desired behavior in which a revision-deletion form appears).
{
"affected": [],
"aliases": [
"CVE-2020-35477"
],
"database_specific": {
"cwe_ids": [
"CWE-20",
"CWE-670"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2020-12-18T08:15:00Z",
"severity": "MODERATE"
},
"details": "MediaWiki before 1.35.1 blocks legitimate attempts to hide log entries in some situations. If one sets MediaWiki:Mainpage to Special:MyLanguage/Main Page, visits a log entry on Special:Log, and toggles the \"Change visibility of selected log entries\" checkbox (or a tags checkbox) next to it, there is a redirection to the main page\u0027s action=historysubmit (instead of the desired behavior in which a revision-deletion form appears).",
"id": "GHSA-wg6c-hmh5-phq6",
"modified": "2022-05-24T17:36:55Z",
"published": "2022-05-24T17:36:55Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-35477"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2020/12/msg00034.html"
},
{
"type": "WEB",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/STT5Z4A3BCXVH3WIPICWU2FP4IPIMUPC"
},
{
"type": "WEB",
"url": "https://lists.wikimedia.org/pipermail/mediawiki-announce/2020-December/000268.html"
},
{
"type": "WEB",
"url": "https://phabricator.wikimedia.org/T205908"
},
{
"type": "WEB",
"url": "https://www.debian.org/security/2020/dsa-4816"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
"type": "CVSS_V3"
}
]
}
No mitigation information available for this CWE.
No CAPEC attack patterns related to this CWE.