CVE-2026-31830
CVE-2026-31830 is a high-severity vulnerability in Sigstore with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-252.
Key facts
- Severity: High (CVSS 3.x base score 7.5)
- EPSS exploit prediction: 0% (12th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-10932
- Weakness: CWE-252
- Affected product: Sigstore
- Published:
- Last modified:
Description
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.
Frequently asked questions
- What is CVE-2026-31830?
- 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.
- How severe is CVE-2026-31830?
- CVE-2026-31830 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
- Is CVE-2026-31830 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-31830?
- CVE-2026-31830 affects Sigstore. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-31830?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2026-31830 have an EU (EUVD) identifier?
- Yes. CVE-2026-31830 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10932.
- When was CVE-2026-31830 published?
- CVE-2026-31830 was published on 2026-03-10 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:sigstore:sigstore:*:*:*:*:*:ruby:*:*
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