VulnerabilityAnalyzed

CVE-2026-31830

This vulnerability is fixed in 0.2.3.

HIGH 7.5EPSS 0.22%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.22%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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.

CVSS 3.1: 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS: 0.22% probability · 12th percentile
CISA KEV: Not listed
Weakness: CWE-252
Affected: sigstore/sigstore
Source: security-advisories@github.com

References

https://github.com/sigstore/sigstore-ruby/security/advisories/GHSA-mhg6-2q2v-9h2cVendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.