CVE-2026-31830

HIGH

sigstore-ruby < 0.2.3 - Verification Bypass via Unchecked Return Value

Title source: llm

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.

References (1)

Core 1

Core References

Vendor Advisory x_refsource_confirm

https://github.com/sigstore/sigstore-ruby/security/advisories/GHSA-mhg6-2q2v-9h2c

Scores

CVSS v3 7.5

EPSS 0.0022

EPSS Percentile 12.0%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact partial

Details

CWE

CWE-252

Status published

Products (2)

rubygems/sigstore 0 - 0.2.3RubyGems

sigstore/sigstore < 0.2.3

Published Mar 10, 2026

Tracked Since Mar 11, 2026