CVE-2026-49834

MEDIUM5.9

sigstore-go: Multi-log threshold bypass via single compromised log

Published Jul 17, 2026

Modified 1 months ago

Details

sigstore-go is a Go library for Sigstore signing and verification. Prior to 1.2.0, a verifier configured with WithTransparencyLog(N>1) or WithSignedCertificateTimestamps(N>1) counts verified witnesses per entry or per validation path rather than per log authority, allowing a single compromised transparency log or CT log to satisfy multi-log threshold requirements and defeat the multi-log policy. This issue is fixed in version 1.2.0.

References

WEB

https://github.com/sigstore/sigstore-go/commit/dbb07e62623edd5b175fb9dd5a41dcb85a159207

WEB

https://github.com/sigstore/sigstore-go/pull/633

WEB

https://github.com/sigstore/sigstore-go/releases/tag/v1.2.0

WEB

https://github.com/sigstore/sigstore-go/security/advisories/GHSA-9vcr-p3rj-q5q6

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-49834

CVSS Analysis