CVE-2026-49834

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

Published Jul 17, 2026 CVSS 3.1 · 5.9 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-9vcr-p3rj-q5q6 sigstore-go has a multi-log threshold bypass via single compromised log
History
Type Values Removed Values Added
First Time appeared Sigstore
Sigstore sigstore-go
Vendors & Products Sigstore
Sigstore sigstore-go
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title sigstore-go: Multi-log threshold bypass via single compromised log
Weaknesses CWE-347
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Jul 17, 2026, 7:42 PM
Reserved
Jun 1, 2026, 6:50 PM
Status
Analyzed
Published
Jul 17, 2026, 8:17 PM
Modified
Oct 24, 2026, 8:10 PM