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CVE-2026-49834
sigstore-go: Multi-log threshold bypass via single compromised log
Medium5.9EPSS 0.18%
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Medium5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N |
| NVDNVD · Analyzed | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
- EPSS (exploitation in 30 days)
- 0.18% · top 92% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
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The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.9.
Weakness
Affected products
- affected < 1.2.0
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Gogithub.com/sigstore/sigstore-goGHSA-9vcr-p3rj-q5q6 (opens in a new tab)
References (4)
- https://github.com/sigstore/sigstore-go/security/advisories/GHSA-9vcr-p3rj-q5q6 (opens in a new tab)x_refsource_CONFIRM
- https://github.com/sigstore/sigstore-go/pull/633 (opens in a new tab)x_refsource_MISC
- https://github.com/sigstore/sigstore-go/commit/dbb07e62623edd5b175fb9dd5a41dcb85a159207 (opens in a new tab)x_refsource_MISC
- https://github.com/sigstore/sigstore-go/releases/tag/v1.2.0 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-9vcr-p3rj-q5q6 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://trackcve.app/cve/CVE-2026-49834)Record last updated .