Description
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.
Affected products
sigstore: sigstore-go
References4
- github.com/sigstore/sigstore-go/security/advisories/GHSA-9vcr-p… Vendor Advisory
- github.com/sigstore/sigstore-go/commit/dbb07e62623edd5b175fb9dd… Patch
- github.com/sigstore/sigstore-go/pull/633 Issue TrackingPatch
- github.com/sigstore/sigstore-go/releases/tag/v1.2.0 ProductRelease Notes
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - EPSS — exploit probability
- 0% percentile: 8 · as of 14 November 2026
- CWE
- CWE-347
Could this be exploited in your environment?
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