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78 vulnerabilities by sigstore
CVE-2026-48702 (GCVE-0-2026-48702)
Vulnerability from nvd – Published: 2026-08-13 13:14 – Updated: 2026-08-13 15:16
VLAI
EPSS
VEX
Title
Rekor has an OOM Condition due to Unbounded gzip Decompression in Alpine APK Parsing Logic
Summary
Rekor is a software supply chain transparency log. Starting in version 0.3.0 and prior to version 1.5.2, the `Package.Unmarshal()` function in `pkg/types/alpine/apk.go` decompresses the signature and control gzip members of an APK file into in-memory buffers without bounding the total decompressed size. The existing `max_apk_metadata_size` check (default 1MB) is only applied to individual tar entry header sizes after decompression completes, so it does not prevent a decompression bomb from consuming unbounded heap memory. An attacker can craft a gzip stream that compresses at a ~1000:1 ratio (e.g., 2MB compressed zeros → 2GB decompressed). When submitted as spec.package.content in an Alpine `ProposedEntry`, the server decompresses the full payload into memory during request processing, triggering a fatal Go runtime out-of-memory error or OS OOM-kill that cannot be caught by the server's recover() middleware. This is reachable via two unauthenticated endpoints, `POST /api/v1/log/entries (createLogEntry)` and `POST /api/v1/log/entries/retrieve (searchLogQuery)`. Both invoke `V001Entry.Canonicalize()` → `fetchExternalEntities()` → `apk.Unmarshal(packageData)`, which performs the unbounded decompression. Version 1.5.2 patches the issue. There is no effective workaround. Setting `max_request_body_size` reduces but does not eliminate exposure due to the ~1000:1 compression ratio (a 1MB body limit still allows ~1GB heap allocation). Setting `max_apk_metadata_size` has no effect on this vulnerability since the check is applied after decompression.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 15:12 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/sigstore/rekor/security/adviso… | x_refsource_CONFIRM |
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CVE-2026-49478 (GCVE-0-2026-49478)
Vulnerability from nvd – Published: 2026-08-13 13:08 – Updated: 2026-08-15 03:14
VLAI
EPSS
VEX
Title
Fulcio has OIDC Discovery Redirect Following Allows SSRF and JWKS Substitution for Meta-Issuer Paths, with Kubernetes Service-Account Token Leakage
Summary
Fulcio is a certificate authority for issuing code signing certificates for an OpenID Connect (OIDC) identity. Versions through 1.8.5 improperly follow cross-host redirects and attach Kubernetes ServiceAccount tokens during OIDC discovery, allowing a malicious or compromised issuer to perform blind SSRF, substitute and cache malicious JWKS keys, or disclose ServiceAccount tokens to external hosts. Version 1.8.6 blocks cross-host redirects, restricts token injection, and restricts local token loading. No known workarounds are available.
Severity
8.7 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-15 03:14 UTC
CWE
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/sigstore/fulcio/security/advis… | x_refsource_CONFIRM |
| https://github.com/sigstore/fulcio/pull/2354 | x_refsource_MISC |
| https://github.com/sigstore/fulcio/commit/378c654… | x_refsource_MISC |
| https://github.com/sigstore/fulcio/releases/tag/v1.8.6 | x_refsource_MISC |
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CVE-2026-48791 (GCVE-0-2026-48791)
Vulnerability from nvd – Published: 2026-08-12 23:42 – Updated: 2026-08-13 13:07
VLAI
EPSS
VEX
Title
Sigstore Java has a vulnerability with bundle verification of integratedTime
Summary
sigstore-java is a sigstore java client for interacting with sigstore infrastructure. Version 2.0.0 erroneously removed verification of the integrated (Rekor entry) time) against the Fulcio certificate. Version 2.1.0 re-added this verification with enhancements that adhere to the Sigstore verification spec. The old sigstore-conformance test for this check was built incorrectly. This vulnerability impacts only users verifying bundles with `dev.sigstore:sigstore-java:2.0.0`. Older versions are not affected; it is fixed in `dev.sigstore:sigstore-java:2.1.0` A malicious actor may exploit this if they were able to access a users system and exfiltrate the temporary private key used during signing and then reuse an old fulcio certificate later without requiring direct access to the user's credentials. Users may protect themselves by re-verifying their artifacts using the newest sigstore-java or another current sigstore client. Transparency logs may also be audited for unauthorized signatures for a suspected reused identity.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 13:06 UTC
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/sigstore/sigstore-java/securit… | x_refsource_CONFIRM |
| https://github.com/sigstore/sigstore-java/pull/1008 | x_refsource_MISC |
| https://github.com/sigstore/sigstore-java/pull/1185 | x_refsource_MISC |
| https://github.com/sigstore/sigstore-java/commit/… | x_refsource_MISC |
| https://github.com/sigstore/sigstore-java/commit/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| sigstore | sigstore-java |
Affected:
= 2.0.0
|
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CVE-2026-54787 (GCVE-0-2026-54787)
Vulnerability from nvd – Published: 2026-07-31 21:58 – Updated: 2026-07-31 23:36
VLAI
EPSS
VEX
Title
sigstore-go fails to check signature timestamps against a signing key's validity period
Summary
sigstore-go is a Go library for Sigstore signing and verification. Prior to 1.2.1, sigstore-go does not check a bundle signing timestamp against the validity window of an ExpiringKey wrapping a self-managed long-lived signing key without a certificate, which can allow an attacker holding expired key material to sign accepted bundles. This issue is fixed in version 1.2.1.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-31 23:35 UTC
CWE
- CWE-324 - Use of a Key Past its Expiration Date
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/sigstore/sigstore-go/security/… | x_refsource_CONFIRM |
| https://github.com/sigstore/sigstore-go/pull/642 | x_refsource_MISC |
| https://github.com/sigstore/sigstore-go/commit/45… | x_refsource_MISC |
| https://github.com/sigstore/sigstore-go/releases/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| sigstore | sigstore-go |
Affected:
< 1.2.1
|
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CVE-2026-49834 (GCVE-0-2026-49834)
Vulnerability from nvd – Published: 2026-07-17 19:20 – Updated: 2026-07-17 19:42
VLAI
EPSS
VEX
Title
sigstore-go: Multi-log threshold bypass via single compromised log
Summary
sigstore-go is a Go library for Sigstore signing and verification. Prior to 1.2.0, a verifier configured with WithTransparencyLog(N>1) or WithSignedCertificateTimestamps(N>1) counts verified witnesses per entry or per validation path rather than per log authority, allowing a single compromised transparency log or CT log to satisfy multi-log threshold requirements and defeat the multi-log policy. This issue is fixed in version 1.2.0.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-17 19:42 UTC
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/sigstore/sigstore-go/security/… | x_refsource_CONFIRM |
| https://github.com/sigstore/sigstore-go/pull/633 | x_refsource_MISC |
| https://github.com/sigstore/sigstore-go/commit/db… | x_refsource_MISC |
| https://github.com/sigstore/sigstore-go/releases/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| sigstore | sigstore-go |
Affected:
< 1.2.0
|
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CVE-2026-49835 (GCVE-0-2026-49835)
Vulnerability from nvd – Published: 2026-07-17 18:16 – Updated: 2026-07-17 19:45
VLAI
EPSS
VEX
Title
Sigstore Timestamp Authority: OOM due to unbounded metric label cardinality
Summary
Sigstore Timestamp Authority is a service for issuing RFC 3161 timestamps. Prior to 2.1.0, the global wrapMetrics middleware records raw HTTP request path r.URL.Path and raw HTTP request method r.Method as Prometheus labels for latency and request count metric vectors before routing, allowing an unauthenticated remote attacker to issue requests with random paths such as /api/v1/timestamp/<uuid> or random HTTP methods and create unbounded permanent time-series entries that exhaust memory. This issue is fixed in version 2.1.0.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-17 19:45 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/sigstore/timestamp-authority/s… | x_refsource_CONFIRM |
| https://github.com/sigstore/timestamp-authority/c… | x_refsource_MISC |
| https://github.com/sigstore/timestamp-authority/r… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| sigstore | timestamp-authority |
Affected:
< 2.1.0
|
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CVE-2026-48816 (GCVE-0-2026-48816)
Vulnerability from nvd – Published: 2026-07-14 20:39 – Updated: 2026-07-15 14:26
VLAI
EPSS
VEX
Title
sigstore-js: Insufficient Verification of Data Authenticity
Summary
sigstore-js provides JavaScript libraries for interacting with Sigstore services. Prior to 3.1.1, @sigstore/verify derives a transparency-log timestamp from tlogEntries[].integratedTime for bundle v0.2 inclusionProof-only entries even though the inclusion proof path does not cryptographically bind integratedTime, allowing an attacker who can supply an untrusted bundle to influence certificate validity and timestampThreshold verification decisions. This issue is fixed in version 3.1.1.
Severity
6.5 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-15 14:25 UTC
CWE
- CWE-345 - Insufficient Verification of Data Authenticity
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/sigstore/sigstore-js/security/… | x_refsource_CONFIRM |
| https://github.com/sigstore/sigstore-js/pull/1659 | x_refsource_MISC |
| https://github.com/sigstore/sigstore-js/commit/f0… | x_refsource_MISC |
| https://github.com/sigstore/sigstore-js/releases/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| sigstore | sigstore-js |
Affected:
< 3.1.1
|
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CVE-2026-48815 (GCVE-0-2026-48815)
Vulnerability from nvd – Published: 2026-07-14 20:27 – Updated: 2026-07-15 12:56
VLAI
EPSS
VEX
Title
sigstore-js: `certificateOIDs` verification constraints are silently dropped and never enforced
Summary
sigstore-js provides JavaScript libraries for interacting with Sigstore services. Prior to 4.1.1, the documented certificateOIDs option in sigstore.verify() is accepted by the public API but discarded before verification, so required certificate extension OIDs are never checked and applications relying on certificateOIDs to restrict which certificates may sign artifacts can accept unauthorized certificates. This issue is fixed in version 4.1.1.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-15 12:56 UTC
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/sigstore/sigstore-js/security/… | x_refsource_CONFIRM |
| https://github.com/sigstore/sigstore-js/pull/1658 | x_refsource_MISC |
| https://github.com/sigstore/sigstore-js/commit/78… | x_refsource_MISC |
| https://github.com/sigstore/sigstore-js/releases/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| sigstore | sigstore-js |
Affected:
< 4.1.1
|
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CVE-2026-48758 (GCVE-0-2026-48758)
Vulnerability from nvd – Published: 2026-07-14 20:36 – Updated: 2026-07-15 12:54
VLAI
EPSS
VEX
Title
sigstore-js: DSSE payloadType type-binding failure
Summary
sigstore-js provides JavaScript libraries for interacting with Sigstore services. Prior to 3.2.1, the preAuthEncoding function in @sigstore/core uses Node.js ascii encoding when converting the PAE string to bytes, allowing payloadType to be mutated after signing without invalidating the signature and breaking the type-binding guarantee that DSSE is designed to provide. This issue is fixed in version 3.2.1.
Severity
5.4 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-15 12:54 UTC
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/sigstore/sigstore-js/security/… | x_refsource_CONFIRM |
| https://github.com/sigstore/sigstore-js/pull/1657 | x_refsource_MISC |
| https://github.com/sigstore/sigstore-js/commit/b5… | x_refsource_MISC |
| https://github.com/sigstore/sigstore-js/releases/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| sigstore | sigstore-js |
Affected:
< 3.2.1
|
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CVE-2026-59891 (GCVE-0-2026-59891)
Vulnerability from nvd – Published: 2026-07-14 16:54 – Updated: 2026-07-21 18:43
VLAI
EPSS
VEX
Title
Credential confusion in @sigstore/oci can leak registry credentials to an attacker-controlled registry
Summary
sigstore-js provides JavaScript libraries for interacting with Sigstore services. Prior to 0.7.1, getRegistryCredentials() reads credentials from the Docker config file and selects an entry by checking whether any configured auth key contains the target registry string. Because this is a substring match rather than an exact host match, credentials configured for one registry can be selected for and transmitted to a different registry whose hostname has a substring relationship with a configured auth key. This issue is fixed in version 0.7.1.
Severity
9.6 (Critical)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-21 18:43 UTC
CWE
- CWE-522 - Insufficiently Protected Credentials
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/sigstore/sigstore-js/security/… | x_refsource_CONFIRM |
| https://github.com/sigstore/sigstore-js/commit/85… | x_refsource_MISC |
| https://github.com/sigstore/sigstore-js/releases/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| sigstore | sigstore-js |
Affected:
< 0.7.1
|
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CVE-2026-44310 (GCVE-0-2026-44310)
Vulnerability from nvd – Published: 2026-05-15 16:17 – Updated: 2026-05-15 16:44
VLAI
EPSS
VEX
Title
gitsign --verify panics on empty-certificate PKCS7 and exits 0, bypassing exit-code callers
Summary
Gitsign is a keyless Sigstore to signing tool for Git commits with your a GitHub / OIDC identity. From 0.4.0 to before 0.15.0, CertVerifier.Verify() in pkg/git/verifier.go unconditionally dereferences certs[0] after sd.GetCertificates() without checking the slice length. A CMS/PKCS7 signed message with an empty certificate set is a structurally valid DER payload; GetCertificates() returns an empty slice with no error, causing an immediate index-out-of-range panic. On the gitsign --verify code path (the GPG-compatible mode invoked by git verify-commit), the panic is silently recovered by internal/io/streams.go's Wrap() function, which returns nil instead of an error. main.go then exits with code 0, causing exit-code-only verification callers to interpret the failed verification as success. This vulnerability is fixed in 0.15.0.
Severity
5.4 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-15 16:44 UTC
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/sigstore/gitsign/security/advi… | x_refsource_CONFIRM |
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CVE-2026-44309 (GCVE-0-2026-44309)
Vulnerability from nvd – Published: 2026-05-15 16:22 – Updated: 2026-05-15 17:43
VLAI
EPSS
VEX
Title
gitsign verify accepts signatures over go-git-normalized bytes, enabling trust confusion on malformed commits
Summary
Gitsign is a keyless Sigstore to signing tool for Git commits with your a GitHub / OIDC identity. Prior to 0.16.0, gitsign verify and gitsign verify-tag re-encode commit/tag objects through go-git's EncodeWithoutSignature before checking the signature, instead of verifying against the raw git object bytes. For malformed objects with duplicate tree headers, git-core and go-git parse different trees: git-core uses the first, go-git uses the second. A signature crafted over the go-git-normalized form (second tree) passes gitsign verify while git-core resolves the commit to a completely different tree. This breaks the invariant that a verified signature, the commit semantics git-core presents to users, and the object hash logged in Rekor all refer to the same content. This vulnerability is fixed in 0.16.0.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-15 17:43 UTC
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/sigstore/gitsign/security/advi… | x_refsource_CONFIRM |
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CVE-2026-39984 (GCVE-0-2026-39984)
Vulnerability from nvd – Published: 2026-04-14 23:41 – Updated: 2026-04-16 14:00
VLAI
EPSS
VEX
Title
Sigstore Timestamp Authority has Improper Certificate Validation in verifier
Summary
Sigstore Timestamp Authority is a service for issuing RFC 3161 timestamps. Versions 2.0.5 and below contain an authorization bypass vulnerability in the VerifyTimestampResponse function. VerifyTimestampResponse correctly verifies the certificate chain signature, but the TSA-specific constraint checks in VerifyLeafCert uses the first non-CA certificate from the PKCS#7 certificate bag instead of the leaf certificate from the verified chain. An attacker can exploit this by prepending a forged certificate to the certificate bag while the message is signed with an authorized key, causing the library to validate the signature against one certificate but perform authorization checks against another. This vulnerability only affects users of the timestamp-authority/v2/pkg/verification package and does not affect the timestamp-authority service itself or sigstore-go. The issue has been fixed in version 2.0.6.
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-16 14:00 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/sigstore/timestamp-authority/s… | x_refsource_CONFIRM |
| https://github.com/sigstore/timestamp-authority/r… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| sigstore | timestamp-authority |
Affected:
< 2.0.6
|
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CVE-2026-39395 (GCVE-0-2026-39395)
Vulnerability from nvd – Published: 2026-04-07 20:06 – Updated: 2026-04-08 15:49
VLAI
EPSS
VEX
Title
Cosign's verify-blob-attestation reports false positive when payload parsing fails
Summary
Cosign provides code signing and transparency for containers and binaries. Prior to 3.0.6 and 2.6.3, cosign verify-blob-attestation may erroneously report a "Verified OK" result for attestations with malformed payloads or mismatched predicate types. For old-format bundles and detached signatures, this was due to a logic flaw in the error handling of the predicate type validation. For new-format bundles, the predicate type validation was bypassed completely. This vulnerability is fixed in 3.0.6 and 2.6.3.
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-08 15:49 UTC
CWE
- CWE-754 - Improper Check for Unusual or Exceptional Conditions
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/sigstore/cosign/security/advis… | x_refsource_CONFIRM |
Impacted products
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CVE-2026-31830 (GCVE-0-2026-31830)
Vulnerability from nvd – Published: 2026-03-10 21:46 – Updated: 2026-03-11 15:59
VLAI
EPSS
VEX
Title
sigstore-ruby verifier returns success for DSSE bundles with mismatched in-toto subject digest
Summary
sigstore-ruby is a pure Ruby implementation of the sigstore verify command from the sigstore/cosign project. Prior to 0.2.3, Sigstore::Verifier#verify does not propagate the VerificationFailure returned by verify_in_toto when the artifact digest does not match the digest in the in-toto attestation subject. As a result, verification of DSSE bundles containing in-toto statements returns VerificationSuccess regardless of whether the artifact matches the attested subject. This vulnerability is fixed in 0.2.3.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-11 15:53 UTC
CWE
- CWE-252 - Unchecked Return Value
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/sigstore/sigstore-ruby/securit… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| sigstore | sigstore-ruby |
Affected:
< 0.2.3
|
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CVE-2026-48702 (GCVE-0-2026-48702)
Vulnerability from cvelistv5 – Published: 2026-08-13 13:14 – Updated: 2026-08-13 15:16
VLAI
EPSS
VEX
Title
Rekor has an OOM Condition due to Unbounded gzip Decompression in Alpine APK Parsing Logic
Summary
Rekor is a software supply chain transparency log. Starting in version 0.3.0 and prior to version 1.5.2, the `Package.Unmarshal()` function in `pkg/types/alpine/apk.go` decompresses the signature and control gzip members of an APK file into in-memory buffers without bounding the total decompressed size. The existing `max_apk_metadata_size` check (default 1MB) is only applied to individual tar entry header sizes after decompression completes, so it does not prevent a decompression bomb from consuming unbounded heap memory. An attacker can craft a gzip stream that compresses at a ~1000:1 ratio (e.g., 2MB compressed zeros → 2GB decompressed). When submitted as spec.package.content in an Alpine `ProposedEntry`, the server decompresses the full payload into memory during request processing, triggering a fatal Go runtime out-of-memory error or OS OOM-kill that cannot be caught by the server's recover() middleware. This is reachable via two unauthenticated endpoints, `POST /api/v1/log/entries (createLogEntry)` and `POST /api/v1/log/entries/retrieve (searchLogQuery)`. Both invoke `V001Entry.Canonicalize()` → `fetchExternalEntities()` → `apk.Unmarshal(packageData)`, which performs the unbounded decompression. Version 1.5.2 patches the issue. There is no effective workaround. Setting `max_request_body_size` reduces but does not eliminate exposure due to the ~1000:1 compression ratio (a 1MB body limit still allows ~1GB heap allocation). Setting `max_apk_metadata_size` has no effect on this vulnerability since the check is applied after decompression.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 15:12 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/sigstore/rekor/security/adviso… | x_refsource_CONFIRM |
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CVE-2026-49478 (GCVE-0-2026-49478)
Vulnerability from cvelistv5 – Published: 2026-08-13 13:08 – Updated: 2026-08-15 03:14
VLAI
EPSS
VEX
Title
Fulcio has OIDC Discovery Redirect Following Allows SSRF and JWKS Substitution for Meta-Issuer Paths, with Kubernetes Service-Account Token Leakage
Summary
Fulcio is a certificate authority for issuing code signing certificates for an OpenID Connect (OIDC) identity. Versions through 1.8.5 improperly follow cross-host redirects and attach Kubernetes ServiceAccount tokens during OIDC discovery, allowing a malicious or compromised issuer to perform blind SSRF, substitute and cache malicious JWKS keys, or disclose ServiceAccount tokens to external hosts. Version 1.8.6 blocks cross-host redirects, restricts token injection, and restricts local token loading. No known workarounds are available.
Severity
8.7 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-15 03:14 UTC
CWE
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/sigstore/fulcio/security/advis… | x_refsource_CONFIRM |
| https://github.com/sigstore/fulcio/pull/2354 | x_refsource_MISC |
| https://github.com/sigstore/fulcio/commit/378c654… | x_refsource_MISC |
| https://github.com/sigstore/fulcio/releases/tag/v1.8.6 | x_refsource_MISC |
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CVE-2026-48791 (GCVE-0-2026-48791)
Vulnerability from cvelistv5 – Published: 2026-08-12 23:42 – Updated: 2026-08-13 13:07
VLAI
EPSS
VEX
Title
Sigstore Java has a vulnerability with bundle verification of integratedTime
Summary
sigstore-java is a sigstore java client for interacting with sigstore infrastructure. Version 2.0.0 erroneously removed verification of the integrated (Rekor entry) time) against the Fulcio certificate. Version 2.1.0 re-added this verification with enhancements that adhere to the Sigstore verification spec. The old sigstore-conformance test for this check was built incorrectly. This vulnerability impacts only users verifying bundles with `dev.sigstore:sigstore-java:2.0.0`. Older versions are not affected; it is fixed in `dev.sigstore:sigstore-java:2.1.0` A malicious actor may exploit this if they were able to access a users system and exfiltrate the temporary private key used during signing and then reuse an old fulcio certificate later without requiring direct access to the user's credentials. Users may protect themselves by re-verifying their artifacts using the newest sigstore-java or another current sigstore client. Transparency logs may also be audited for unauthorized signatures for a suspected reused identity.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 13:06 UTC
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/sigstore/sigstore-java/securit… | x_refsource_CONFIRM |
| https://github.com/sigstore/sigstore-java/pull/1008 | x_refsource_MISC |
| https://github.com/sigstore/sigstore-java/pull/1185 | x_refsource_MISC |
| https://github.com/sigstore/sigstore-java/commit/… | x_refsource_MISC |
| https://github.com/sigstore/sigstore-java/commit/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| sigstore | sigstore-java |
Affected:
= 2.0.0
|
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CVE-2026-54787 (GCVE-0-2026-54787)
Vulnerability from cvelistv5 – Published: 2026-07-31 21:58 – Updated: 2026-07-31 23:36
VLAI
EPSS
VEX
Title
sigstore-go fails to check signature timestamps against a signing key's validity period
Summary
sigstore-go is a Go library for Sigstore signing and verification. Prior to 1.2.1, sigstore-go does not check a bundle signing timestamp against the validity window of an ExpiringKey wrapping a self-managed long-lived signing key without a certificate, which can allow an attacker holding expired key material to sign accepted bundles. This issue is fixed in version 1.2.1.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-31 23:35 UTC
CWE
- CWE-324 - Use of a Key Past its Expiration Date
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/sigstore/sigstore-go/security/… | x_refsource_CONFIRM |
| https://github.com/sigstore/sigstore-go/pull/642 | x_refsource_MISC |
| https://github.com/sigstore/sigstore-go/commit/45… | x_refsource_MISC |
| https://github.com/sigstore/sigstore-go/releases/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| sigstore | sigstore-go |
Affected:
< 1.2.1
|
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CVE-2026-49834 (GCVE-0-2026-49834)
Vulnerability from cvelistv5 – Published: 2026-07-17 19:20 – Updated: 2026-07-17 19:42
VLAI
EPSS
VEX
Title
sigstore-go: Multi-log threshold bypass via single compromised log
Summary
sigstore-go is a Go library for Sigstore signing and verification. Prior to 1.2.0, a verifier configured with WithTransparencyLog(N>1) or WithSignedCertificateTimestamps(N>1) counts verified witnesses per entry or per validation path rather than per log authority, allowing a single compromised transparency log or CT log to satisfy multi-log threshold requirements and defeat the multi-log policy. This issue is fixed in version 1.2.0.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-17 19:42 UTC
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/sigstore/sigstore-go/security/… | x_refsource_CONFIRM |
| https://github.com/sigstore/sigstore-go/pull/633 | x_refsource_MISC |
| https://github.com/sigstore/sigstore-go/commit/db… | x_refsource_MISC |
| https://github.com/sigstore/sigstore-go/releases/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| sigstore | sigstore-go |
Affected:
< 1.2.0
|
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CVE-2026-49835 (GCVE-0-2026-49835)
Vulnerability from cvelistv5 – Published: 2026-07-17 18:16 – Updated: 2026-07-17 19:45
VLAI
EPSS
VEX
Title
Sigstore Timestamp Authority: OOM due to unbounded metric label cardinality
Summary
Sigstore Timestamp Authority is a service for issuing RFC 3161 timestamps. Prior to 2.1.0, the global wrapMetrics middleware records raw HTTP request path r.URL.Path and raw HTTP request method r.Method as Prometheus labels for latency and request count metric vectors before routing, allowing an unauthenticated remote attacker to issue requests with random paths such as /api/v1/timestamp/<uuid> or random HTTP methods and create unbounded permanent time-series entries that exhaust memory. This issue is fixed in version 2.1.0.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-17 19:45 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/sigstore/timestamp-authority/s… | x_refsource_CONFIRM |
| https://github.com/sigstore/timestamp-authority/c… | x_refsource_MISC |
| https://github.com/sigstore/timestamp-authority/r… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| sigstore | timestamp-authority |
Affected:
< 2.1.0
|
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CVE-2026-48816 (GCVE-0-2026-48816)
Vulnerability from cvelistv5 – Published: 2026-07-14 20:39 – Updated: 2026-07-15 14:26
VLAI
EPSS
VEX
Title
sigstore-js: Insufficient Verification of Data Authenticity
Summary
sigstore-js provides JavaScript libraries for interacting with Sigstore services. Prior to 3.1.1, @sigstore/verify derives a transparency-log timestamp from tlogEntries[].integratedTime for bundle v0.2 inclusionProof-only entries even though the inclusion proof path does not cryptographically bind integratedTime, allowing an attacker who can supply an untrusted bundle to influence certificate validity and timestampThreshold verification decisions. This issue is fixed in version 3.1.1.
Severity
6.5 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-15 14:25 UTC
CWE
- CWE-345 - Insufficient Verification of Data Authenticity
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/sigstore/sigstore-js/security/… | x_refsource_CONFIRM |
| https://github.com/sigstore/sigstore-js/pull/1659 | x_refsource_MISC |
| https://github.com/sigstore/sigstore-js/commit/f0… | x_refsource_MISC |
| https://github.com/sigstore/sigstore-js/releases/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| sigstore | sigstore-js |
Affected:
< 3.1.1
|
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CVE-2026-48758 (GCVE-0-2026-48758)
Vulnerability from cvelistv5 – Published: 2026-07-14 20:36 – Updated: 2026-07-15 12:54
VLAI
EPSS
VEX
Title
sigstore-js: DSSE payloadType type-binding failure
Summary
sigstore-js provides JavaScript libraries for interacting with Sigstore services. Prior to 3.2.1, the preAuthEncoding function in @sigstore/core uses Node.js ascii encoding when converting the PAE string to bytes, allowing payloadType to be mutated after signing without invalidating the signature and breaking the type-binding guarantee that DSSE is designed to provide. This issue is fixed in version 3.2.1.
Severity
5.4 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-15 12:54 UTC
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/sigstore/sigstore-js/security/… | x_refsource_CONFIRM |
| https://github.com/sigstore/sigstore-js/pull/1657 | x_refsource_MISC |
| https://github.com/sigstore/sigstore-js/commit/b5… | x_refsource_MISC |
| https://github.com/sigstore/sigstore-js/releases/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| sigstore | sigstore-js |
Affected:
< 3.2.1
|
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CVE-2026-48815 (GCVE-0-2026-48815)
Vulnerability from cvelistv5 – Published: 2026-07-14 20:27 – Updated: 2026-07-15 12:56
VLAI
EPSS
VEX
Title
sigstore-js: `certificateOIDs` verification constraints are silently dropped and never enforced
Summary
sigstore-js provides JavaScript libraries for interacting with Sigstore services. Prior to 4.1.1, the documented certificateOIDs option in sigstore.verify() is accepted by the public API but discarded before verification, so required certificate extension OIDs are never checked and applications relying on certificateOIDs to restrict which certificates may sign artifacts can accept unauthorized certificates. This issue is fixed in version 4.1.1.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-15 12:56 UTC
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/sigstore/sigstore-js/security/… | x_refsource_CONFIRM |
| https://github.com/sigstore/sigstore-js/pull/1658 | x_refsource_MISC |
| https://github.com/sigstore/sigstore-js/commit/78… | x_refsource_MISC |
| https://github.com/sigstore/sigstore-js/releases/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| sigstore | sigstore-js |
Affected:
< 4.1.1
|
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CVE-2026-59891 (GCVE-0-2026-59891)
Vulnerability from cvelistv5 – Published: 2026-07-14 16:54 – Updated: 2026-07-21 18:43
VLAI
EPSS
VEX
Title
Credential confusion in @sigstore/oci can leak registry credentials to an attacker-controlled registry
Summary
sigstore-js provides JavaScript libraries for interacting with Sigstore services. Prior to 0.7.1, getRegistryCredentials() reads credentials from the Docker config file and selects an entry by checking whether any configured auth key contains the target registry string. Because this is a substring match rather than an exact host match, credentials configured for one registry can be selected for and transmitted to a different registry whose hostname has a substring relationship with a configured auth key. This issue is fixed in version 0.7.1.
Severity
9.6 (Critical)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-21 18:43 UTC
CWE
- CWE-522 - Insufficiently Protected Credentials
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/sigstore/sigstore-js/security/… | x_refsource_CONFIRM |
| https://github.com/sigstore/sigstore-js/commit/85… | x_refsource_MISC |
| https://github.com/sigstore/sigstore-js/releases/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| sigstore | sigstore-js |
Affected:
< 0.7.1
|
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CVE-2026-44309 (GCVE-0-2026-44309)
Vulnerability from cvelistv5 – Published: 2026-05-15 16:22 – Updated: 2026-05-15 17:43
VLAI
EPSS
VEX
Title
gitsign verify accepts signatures over go-git-normalized bytes, enabling trust confusion on malformed commits
Summary
Gitsign is a keyless Sigstore to signing tool for Git commits with your a GitHub / OIDC identity. Prior to 0.16.0, gitsign verify and gitsign verify-tag re-encode commit/tag objects through go-git's EncodeWithoutSignature before checking the signature, instead of verifying against the raw git object bytes. For malformed objects with duplicate tree headers, git-core and go-git parse different trees: git-core uses the first, go-git uses the second. A signature crafted over the go-git-normalized form (second tree) passes gitsign verify while git-core resolves the commit to a completely different tree. This breaks the invariant that a verified signature, the commit semantics git-core presents to users, and the object hash logged in Rekor all refer to the same content. This vulnerability is fixed in 0.16.0.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-15 17:43 UTC
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/sigstore/gitsign/security/advi… | x_refsource_CONFIRM |
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CVE-2026-44310 (GCVE-0-2026-44310)
Vulnerability from cvelistv5 – Published: 2026-05-15 16:17 – Updated: 2026-05-15 16:44
VLAI
EPSS
VEX
Title
gitsign --verify panics on empty-certificate PKCS7 and exits 0, bypassing exit-code callers
Summary
Gitsign is a keyless Sigstore to signing tool for Git commits with your a GitHub / OIDC identity. From 0.4.0 to before 0.15.0, CertVerifier.Verify() in pkg/git/verifier.go unconditionally dereferences certs[0] after sd.GetCertificates() without checking the slice length. A CMS/PKCS7 signed message with an empty certificate set is a structurally valid DER payload; GetCertificates() returns an empty slice with no error, causing an immediate index-out-of-range panic. On the gitsign --verify code path (the GPG-compatible mode invoked by git verify-commit), the panic is silently recovered by internal/io/streams.go's Wrap() function, which returns nil instead of an error. main.go then exits with code 0, causing exit-code-only verification callers to interpret the failed verification as success. This vulnerability is fixed in 0.15.0.
Severity
5.4 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-15 16:44 UTC
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/sigstore/gitsign/security/advi… | x_refsource_CONFIRM |
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CVE-2026-39984 (GCVE-0-2026-39984)
Vulnerability from cvelistv5 – Published: 2026-04-14 23:41 – Updated: 2026-04-16 14:00
VLAI
EPSS
VEX
Title
Sigstore Timestamp Authority has Improper Certificate Validation in verifier
Summary
Sigstore Timestamp Authority is a service for issuing RFC 3161 timestamps. Versions 2.0.5 and below contain an authorization bypass vulnerability in the VerifyTimestampResponse function. VerifyTimestampResponse correctly verifies the certificate chain signature, but the TSA-specific constraint checks in VerifyLeafCert uses the first non-CA certificate from the PKCS#7 certificate bag instead of the leaf certificate from the verified chain. An attacker can exploit this by prepending a forged certificate to the certificate bag while the message is signed with an authorized key, causing the library to validate the signature against one certificate but perform authorization checks against another. This vulnerability only affects users of the timestamp-authority/v2/pkg/verification package and does not affect the timestamp-authority service itself or sigstore-go. The issue has been fixed in version 2.0.6.
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-16 14:00 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/sigstore/timestamp-authority/s… | x_refsource_CONFIRM |
| https://github.com/sigstore/timestamp-authority/r… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| sigstore | timestamp-authority |
Affected:
< 2.0.6
|
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CVE-2026-39395 (GCVE-0-2026-39395)
Vulnerability from cvelistv5 – Published: 2026-04-07 20:06 – Updated: 2026-04-08 15:49
VLAI
EPSS
VEX
Title
Cosign's verify-blob-attestation reports false positive when payload parsing fails
Summary
Cosign provides code signing and transparency for containers and binaries. Prior to 3.0.6 and 2.6.3, cosign verify-blob-attestation may erroneously report a "Verified OK" result for attestations with malformed payloads or mismatched predicate types. For old-format bundles and detached signatures, this was due to a logic flaw in the error handling of the predicate type validation. For new-format bundles, the predicate type validation was bypassed completely. This vulnerability is fixed in 3.0.6 and 2.6.3.
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-08 15:49 UTC
CWE
- CWE-754 - Improper Check for Unusual or Exceptional Conditions
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/sigstore/cosign/security/advis… | x_refsource_CONFIRM |
Impacted products
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CVE-2026-31830 (GCVE-0-2026-31830)
Vulnerability from cvelistv5 – Published: 2026-03-10 21:46 – Updated: 2026-03-11 15:59
VLAI
EPSS
VEX
Title
sigstore-ruby verifier returns success for DSSE bundles with mismatched in-toto subject digest
Summary
sigstore-ruby is a pure Ruby implementation of the sigstore verify command from the sigstore/cosign project. Prior to 0.2.3, Sigstore::Verifier#verify does not propagate the VerificationFailure returned by verify_in_toto when the artifact digest does not match the digest in the in-toto attestation subject. As a result, verification of DSSE bundles containing in-toto statements returns VerificationSuccess regardless of whether the artifact matches the attested subject. This vulnerability is fixed in 0.2.3.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-11 15:53 UTC
CWE
- CWE-252 - Unchecked Return Value
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/sigstore/sigstore-ruby/securit… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| sigstore | sigstore-ruby |
Affected:
< 0.2.3
|
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