What’s Vulnerable › Vulnerabilities
CVE-2026-31830: sigstore-ruby verifier returns success for DSSE bundles with mismatched in-toto subject digest
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-03-10 · updated 2026-06-17
- Weakness: CWE-252
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.
Affected products
- sigstore: before 0.2.3 — fixed in 0.2.3
How to fix
Upgrade to a fixed version: sigstore 0.2.3. Check the vendor advisory for mitigations.
References
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