CVE-2026-31830: Sigstore

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Sigstore Sigstore: before 0.2.3 (fixed in 0.2.3)

Published 2026-03-10. Last modified 2026-06-17.