CVE-2026-31830: CVE-2026-31830: Verification Bypass via Unchecked Return Value in sigstore-ruby - CVE Security Report

CVE-2026-31830.md

CVE-2026-31830: CVE-2026-31830: Verification Bypass via Unchecked Return Value in sigstore-ruby

CVSS Score: 7.5 Published: 2026-03-11 Full Report: https://cvereports.com/reports/CVE-2026-31830

Summary

sigstore-ruby prior to version 0.2.3 contains a critical logic flaw in its verification routine for DSSE bundles. An unchecked return value allows an attacker to bypass artifact binding checks, facilitating supply chain attacks via artifact swapping.

TL;DR

A missing return value check in sigstore-ruby allows attackers to bind legitimate Sigstore signatures to malicious artifacts, achieving complete verification bypass.

Exploit Status: POC

Technical Details

• CWE ID: CWE-252 (Unchecked Return Value)
• Attack Vector: Network
• CVSS v3.1 Score: 7.5 (High)
• EPSS Score: 0
• Impact: Integrity Bypass / Supply Chain Compromise
• Exploit Status: Proof-of-Concept
• KEV Status: Not Listed

Affected Systems

• sigstore-ruby < 0.2.3
• Ruby applications implementing Sigstore DSSE bundle verification
• sigstore-ruby: < 0.2.3 (Fixed in: 0.2.3)

Mitigation

• Upgrade sigstore-ruby to version 0.2.3 or higher.
• Implement manual digest verification of in-toto payloads if patching is delayed.
• Audit CI/CD pipeline logs for instances of unexpected artifact digest mismatches prior to patch application.

Remediation Steps:

1. Identify all projects utilizing sigstore-ruby in Gemfile or gemspec.
2. Update the version constraint to require >= 0.2.3.
3. Run bundle update sigstore-ruby.
4. Execute the project's test suite to ensure the updated verification logic functions correctly with valid bundles.
5. Deploy the updated application to production and CI environments.

References

• GitHub Security Advisory: GHSA-mhg6-2q2v-9h2c
• CVE Record: CVE-2026-31830
• NVD Record: CVE-2026-31830

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