Vulnerability in Sigstore
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.
EPSS: 0.002 (12.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
Affected products
- Sigstore
- Sigstore Sigstore-ruby — versions < 0.2.3
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-31830?
- CVE-2026-31830 is a high-severity vulnerability in Sigstore, classified under CWE-252. CVSS score: 7.5/10. Published 2026-03-10.
- How severe is CVE-2026-31830?
- High severity. CVSS v3 base score is 7.5 out of 10.