CVE-2026-31830 — sigstore-ruby verifier returns success for DSSE bundles with mismatched in-toto subject digest
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 Ver…
Published: 2026-03-10 · CVSS: 7.5 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7