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CVE-2026-31830

sigstore-ruby verifier returns success for DSSE bundles with mismatched in-toto subject digest

Published: Mar 10, 2026Updated: Mar 20, 2026 Sources: CVE List NVD GHSACWE-252
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.2%
Top 88.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-252

Affected Products

sigstoresigstore
On-prem
Security Products / pki-crypto
sigstore-rubysigstore
On-prem
Security Products / pki-crypto
sigstoreRubyGemsOSS Libraries
sigstoreoss-projectSecurity Productsaka cosign, gitsign, rekor
rubygemspackage-ecosystemOSS Libraries

Exploitability

Official Patch Available

References

https://github.com/sigstore/sigstore-ruby/security/advisories/GHSA-mhg6-2q2v-9h2c
github.com
https://nvd.nist.gov/vuln/detail/CVE-2026-31830
nvd.nist.gov
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/sigstore/CVE-2026-31830.yml
github.com
and 1 more references View all →

Timeline

Published
Mar 10, 2026
Last Updated
Mar 20, 2026

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