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

7.5HIGH

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.

No summary for this CVE yet.

CVSS Vector Breakdown

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

sigstore

oss-projectaka gitsign, cosign, rekor

sigstoreOn-prem

Security Products / pki-crypto

sigstore-rubyOn-prem

Security Products / pki-crypto

RubyGems

package-ecosystem

sigstore

OSS Libraries

Exploitability

Official Patch Available

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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 →

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