Common Weakness Enumeration
CWE-252
AllowedUnchecked Return Value
Abstraction: Base · Status: Draft
The product does not check the return value from a method or function, which can prevent it from detecting unexpected states and conditions.
275 vulnerabilities reference this CWE, most recent first.
CVE-2026-111497 (GCVE-0-2026-111497)
Vulnerability from cvelistv5 – Published: 2026-10-22 13:35 – Updated: 2026-10-27 19:59
VLAI
EPSS
VEX
Title
Out-of-Bounds Write in Google Brotli Decoder
Summary
A buffer overflow vulnerability in the Brotli decoder (c/dec/decode.c) in Google Brotli versions 1.0.3 through 1.2.0 on all platforms allows a remote unauthenticated attacker to corrupt adjacent decoder state memory, disclose sensitive memory contents, cause a denial of service, or potentially execute arbitrary code using a crafted Brotli-compressed stream.
Users need to update any Brotli libraries or binaries between 1.0.3 through 1.2.0 to the latest available version: 1.0.10 or 1.1.1 or 1.2.1.
Severity
SSVC
Exploitation: active
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-27 19:53 UTC
Assigner
References
18 references
Impacted products
Date Public
2026-02-27 07:50
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CVE-2026-110353 (GCVE-0-2026-110353)
Vulnerability from cvelistv5 – Published: 2026-10-22 02:53 – Updated: 2026-10-22 19:10
VLAI
EPSS
VEX
Summary
HAProxy 3.2 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (worker-thread CPU exhaustion) via a truncated HTTP/2 PING frame. h2c_handle_ping in src/mux_h2.c does not check for a short read, unlike the other H2 frame handlers. Because the incomplete frame cannot be processed, its data is never consumed, and the H2 multiplexer tasklet is repeatedly woken by that pending data without making progress. The CPU spins until timeout http-request closes the connection, and an attacker opening many such connections can sustain high CPU usage.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-22 13:42 UTC
CWE
- CWE-252 - Unchecked Return Value
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://git.haproxy.org/?p=haproxy.git;a=commit;h… | vendor-advisory |
Impacted products
4 products
| Vendor | Product | Version | |
|---|---|---|---|
| HAProxy | HAProxy |
Affected:
3.2.0 , < 3.2.26
(custom)
Affected: 3.3.0 , < 3.3.17 (custom) Affected: 3.4.0 , < 3.4.6 (custom) Affected: 3.5-dev , < 3.5-dev9 (custom) |
|
| HAProxy | HAProxy Enterprise Edition |
Affected:
3.2.0r1 , < 3.2r1-378.1259
(custom)
Affected: 3.3.0r1 , < 3.3r1-377.1005 (custom) |
|
| HAProxy | Kubernetes Ingress Controller |
Affected:
3.2.0 , < 3.2.17
(custom)
|
|
| Haproxy | Kubernetes Ingress Controller Enterprise |
Affected:
3.2.0 , < 3.2.17-ee1
(custom)
Affected: 3.0 , < 3.0.16-ee17 (custom) Affected: 1.11 , < 1.11.14-ee11 (custom) |
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CVE-2026-107838 (GCVE-0-2026-107838)
Vulnerability from cvelistv5 – Published: 2026-10-09 17:55 – Updated: 2026-10-13 17:07
VLAI
EPSS
VEX
Title
RIOT: nanocoap_fileserver ignores response initialization failure, leading to reachable assertion
Summary
RIOT is an open-source microcontroller operating system designed for Internet of Things devices and other embedded systems. From version 2023.07 through version 2026.07, nanocoap_fileserver callers in sys/net/application_layer/nanocoap/fileserver.c ignore a failure returned by _resp_init() when coap_build_reply() cannot fit a response header into the response buffer. A remote client can send a CoAP request with a sufficiently large extended token when nanocoap_token_ext is enabled, causing response initialization to fail while _get_file() or _get_directory() continues with stale response state. The path then reaches _calc_szx2() and its pdu->payload_len > reserve assertion, terminating the affected service or device task. No fixed release is available as of this review.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-13 17:07 UTC
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/RIOT-OS/RIOT/security/advisori… | x_refsource_CONFIRM |
| https://github.com/RIOT-OS/RIOT/pull/22745 | x_refsource_MISC |
| https://github.com/RIOT-OS/RIOT/commit/d3a47289c5… | x_refsource_MISC |
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CVE-2026-107785 (GCVE-0-2026-107785)
Vulnerability from cvelistv5 – Published: 2026-10-09 13:15 – Updated: 2026-10-09 16:46
VLAI
EPSS
VEX
Title
Crux Agent silently fails SKA preshared key rotation when SHA-512 peering is negotiated
Summary
Crux Agent from 1.9.0 before 2.0.3 uses the full SKA bilocation key as the WireGuard preshared key. When a peering session negotiates use of SHA-512, the key produced is 64 bytes instead of the 32 bytes WireGuard requires. The agent does not validate this size; instead it attempts to use the `wg set` command to update the live tunnel, and write the invalid key to the WireGuard configuration file. The update fails, so the live tunnel keeps using its previous preshared key until the tunnel is shut down. The tunnel will fail to start when restarted.
For a peer which has never successfully negotiated a 32-byte bilocation key in a Crux C2 organization which has the "Enforce SKA Use" setting turned off, no preshared key will be set for the tunnel. Therefore, an attacker who is able to intercept and store the peer's traffic, and has access (or will have access) to a cryptographically relevant quantum computer, will be able to decrypt the tunnel.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-09 16:15 UTC
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://sirius.computer/security-disclosure-policy/ | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Sirius Computer, Inc. | Crux Agent |
Affected:
1.9.0 , < 2.0.3
(semver)
|
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CVE-2026-106436 (GCVE-0-2026-106436)
Vulnerability from cvelistv5 – Published: 2026-10-08 19:03 – Updated: 2026-10-08 19:52
VLAI
EPSS
VEX
Title
Application denial of service and data truncation via unchecked BSON append failures in MongoDB PHP Driver
Summary
The BSON encoder in the MongoDB PHP Driver does not check some return values after a document exceeds libbson's size limit. This can leave the encoder in an invalid state. An unauthenticated actor who can cause an affected application to encode an unusually large data structure can terminate the PHP worker or cause the resulting document to omit fields. No MongoDB server connection or database authentication is required.
Severity
4.8 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-08 19:51 UTC
CWE
- CWE-252 - Unchecked Return Value
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| MongoDB | PHP Driver |
Affected:
1.3.0 , < 1.21.11
(semver)
Affected: 2.0.0 , < 2.1.11 (semver) Affected: 2.2.0 , < 2.5.4 (semver) |
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CVE-2026-90648 (GCVE-0-2026-90648)
Vulnerability from cvelistv5 – Published: 2026-09-12 23:16 – Updated: 2026-10-23 19:16
VLAI
EPSS
VEX
Summary
wasm2c in WebAssembly wabt through 1.0.41 allows sandbox escape in some situations that primarily involve 32-bit platforms, aka a "table flip" attack. It does not check the return value of calloc() in wasm_rt_allocate_funcref_table() (wasm2c/wasm-rt-impl-tableops.inc). When the funcref table allocation fails, table->data is left NULL while table->size keeps the guest-declared element count; thus, bounds checks still pass and table element accesses resolve to absolute memory addresses (i * sizeof(wasm_rt_funcref_t)). This gives arbitrary read and write of host process memory and - via table.get, table.set, and call_indirect - arbitrary code execution, defeating the isolation that wasm2c exists to provide (a full sandbox escape). wasm2c is used as an in-process sandboxing boundary by RLBox and WasmBoxC, including in Firefox, which compiles the Graphite, Hunspell, Ogg, Expat, and Woff2 libraries via wasm2c to contain untrusted font, media, and XML input. Therefore, sandboxing in these applications is potentially affected. Exploitation requires the funcref table allocation to fail, for example under an address-space limit (RLIMIT_AS), on 32-bit hosts, with vm.overcommit_memory=2, or under memory pressure. On 64-bit Linux with default overcommit the allocation succeeds and the defect is not triggered. The wasm2c memory allocator aborts on calloc failure in the same runtime; the table allocator lacks this abort behavior. This was introduced in commit ab9e0b55 (PR #813).
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-14 16:16 UTC
CWE
- CWE-252 - Unchecked Return Value
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/trustsig-eu/wasm2c-tableflip | exploittechnical-description |
| https://github.com/WebAssembly/wabt | product |
| https://bugzilla.mozilla.org/show_bug.cgi?id=1827704 | related |
| https://blog.mozilla.org/attack-and-defense/2021/… | related |
| https://rlbox.dev | related |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| WebAssembly | wabt |
Affected:
0 , ≤ 1.0.41
(semver)
cpe:2.3:a:webassembly:wabt:*:*:*:*:*:*:*:* |
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CVE-2026-86749 (GCVE-0-2026-86749)
Vulnerability from cvelistv5 – Published: 2026-09-09 13:32 – Updated: 2026-09-19 14:21
VLAI
EPSS
VEX
Title
snipe-it before 8.7.0 Data Loss via Failed Image Write
Summary
Snipe-IT versions <= 8.6.3 (fixed in 8.7.0) do not check the return value of storage write operations in ImageUploadRequest::handleImages(). Because Laravel's default disk mode does not throw on failure, a silently failed Storage::disk('public')->put(...) call still caused the application to delete the previous image via deleteExistingImage() and to reassign and persist the model's image reference to the new filename, destroying the existing image and leaving the database row pointing at a file that was never written. A mirror problem existed in deleteExistingImage(), where a failed Storage::delete() still nulled the model's image field, orphaning the file on disk. The condition is not directly attacker-controlled: it is triggered when any legitimate authenticated user submits an image upload while the storage backend transiently fails (for example an S3 network error, a local filesystem permission problem, or quota exhaustion). The result is unrecoverable loss of the prior image and a durable inconsistency between the database and disk that requires manual reconciliation. All models whose controllers route through ImageUploadRequest::handleImages (assets, asset models, users, companies, manufacturers, locations, categories, suppliers, departments, and other image-carrying models) are affected.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-18 17:43 UTC
CWE
- CWE-252 - Unchecked Return Value
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/grokability/snipe-it/security/… | vendor-advisory |
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Date Public
2026-08-24 00:00
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CVE-2026-86739 (GCVE-0-2026-86739)
Vulnerability from cvelistv5 – Published: 2026-09-09 13:32 – Updated: 2026-09-18 17:23
VLAI
EPSS
VEX
Title
Snipe-IT before 8.7.0 Acceptance Finalization Without Stored Evidence
Summary
Snipe-IT 8.6.3 and earlier do not check the return value of Storage::put() when writing the signature PNG and the generated acceptance PDF in Account\AcceptanceController::store(). On filesystem drivers that return false instead of throwing on a write failure (for example the local disk with restrictive permissions, S3 with expired credentials, or a storage backend that is out of quota), execution continues into $acceptance->accept(), which sets accepted_at and the signature_filename/eula_filename fields, creates the 'accepted' action-log entry, and dispatches completion notifications even though the evidence files were never stored. The result is an acceptance record marked complete whose supporting evidence files do not exist, yielding a materially incomplete compliance artifact for EULA acknowledgement or equipment-receipt workflows. The condition is triggered when an authenticated user completes an acceptance while the storage backend is silently failing writes; an attacker cannot directly force the storage backend into that state. Fixed in Snipe-IT 8.7.0.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-18 17:10 UTC
CWE
- CWE-252 - Unchecked Return Value
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/grokability/snipe-it/security/… | vendor-advisory |
| https://www.vulncheck.com/advisories/snipe-it-bef… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| grokability | snipe-it |
Affected:
0 , < 8.7.0
(semver)
Unaffected: 8.7.0 (semver) cpe:2.3:a:snipeitapp:snipe-it:*:*:*:*:*:*:*:* |
Date Public
2026-08-24 00:00
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CVE-2026-86141 (GCVE-0-2026-86141)
Vulnerability from cvelistv5 – Published: 2026-09-05 04:27 – Updated: 2026-09-09 19:15
VLAI
EPSS
VEX
Summary
xmlregexp in libxml2 before 2.15.4 has a NULL pointer dereference in xmlRegNewParserCtxt after a strdup failure, i.e., it does not calculate a string length after NULL checking.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-09 19:15 UTC
CWE
- CWE-252 - Unchecked Return Value
Assigner
References
Impacted products
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CVE-2026-85649 (GCVE-0-2026-85649)
Vulnerability from cvelistv5 – Published: 2026-09-04 12:59 – Updated: 2026-09-04 17:59
VLAI
EPSS
VEX
Summary
(Holloway) Chew, Kean Ho's Actualizer v1.2.0 and earlier contains a fail-open password validation vulnerability in the Alpha user and root user password loops of Shell/debian-minbase-install.sh. The installer invokes mkpasswd to generate yescrypt password hashes but does not check the command's return value and unconditionally accepts the result. If mkpasswd fails to generate a yescrypt hash, for example because an incompatible mkpasswd implementation or an environment without yescrypt support is used, the resulting password hash variable can be empty and the build proceeds. The resulting image can therefore contain empty password fields for the root and alpha accounts, potentially permitting passwordless authentication depending on the authentication configuration.
Severity
7.9 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-04 17:59 UTC
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/ChewKeanHo/software-actualizer… | release-notespatch |
| https://github.com/ChewKeanHo/software-actualizer… | patch |
| https://github.com/ChewKeanHo/software-actualizer… | |
| https://doi.org/10.5281/zenodo.22169659 | technical-description |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| chewkeanho | software-actualizer |
Affected:
0 , ≤ 1.2.0
(semver)
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"tags": [
"patch"
],
"url": "https://github.com/ChewKeanHo/software-actualizer/commit/50a0932ac705635d9af62955c353e7c6df003a61.patch"
},
{
"url": "https://github.com/ChewKeanHo/software-actualizer/blob/v1.2.0/Shell/debian-minbase-install.sh#L788"
},
{
"tags": [
"technical-description"
],
"url": "https://doi.org/10.5281/zenodo.22169659"
}
],
"solutions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eUpgrade to Actualizer v1.2.1 or later. The fixed version validates that the generated password hash has the expected yescrypt prefix and performs a pre-flight check for yescrypt support before building.\u003c/p\u003e"
}
],
"value": "Upgrade to Actualizer v1.2.1 or later. The fixed version validates that the generated password hash has the expected yescrypt prefix and performs a pre-flight check for yescrypt support before building."
}
],
"source": {
"discovery": "UNKNOWN"
},
"x_generator": {
"engine": "Vulnogram 0.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
"assignerShortName": "CIRCL",
"cveId": "CVE-2026-85649",
"datePublished": "2026-09-04T12:59:59.743Z",
"dateReserved": "2026-09-04T12:58:10.268Z",
"dateUpdated": "2026-09-04T17:59:26.205Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
Mitigation MIT-53
Implementation
Check the results of all functions that return a value and verify that the value is expected.
Mitigation MIT-56
Implementation
For any pointers that could have been modified or provided from a function that can return NULL, check the pointer for NULL before use. When working with a multithreaded or otherwise asynchronous environment, ensure that proper locking APIs are used to lock before the check, and unlock when it has finished [REF-1484].
Mitigation
Implementation
Ensure that you account for all possible return values from the function.
Mitigation
Implementation
When designing a function, make sure you return a value or throw an exception in case of an error.
No CAPEC attack patterns related to this CWE.