CVE-2026-49834

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.

CVSS v3 5.9 MEDIUM

5.9^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.2 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/sigstore/sigstore-go/commit/dbb07e62623edd5b175fb9dd5a41dcb85a159207	Patch
https://github.com/sigstore/sigstore-go/pull/633	Issue Tracking Patch
https://github.com/sigstore/sigstore-go/releases/tag/v1.2.0	Product Release Notes
https://github.com/sigstore/sigstore-go/security/advisories/GHSA-9vcr-p3rj-q5q6	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:sigstore:sigstore-go:*:*:*:*:*:*:*:*

History

24 Oct 2026, 20:10

Type	Values Removed	Values Added
Summary		(es) sigstore-go es una biblioteca Go para la firma y verificación de Sigstore. Antes de la versión 1.2.0, un verificador configurado con WithTransparencyLog(N>1) o WithSignedCertificateTimestamps(N>1) cuenta los testigos verificados por entrada o por ruta de validación en lugar de por autoridad de registro, lo que permite que un único registro de transparencia comprometido o registro CT satisfaga los requisitos de umbral de múltiples registros y anule la política de múltiples registros. Este problema está solucionado en la versión 1.2.0.

Information

Published : 2026-07-17 20:17

Updated : 2026-10-24 20:10

NVD link : CVE-2026-49834

Mitre link : CVE-2026-49834

CVE.ORG link : CVE-2026-49834

JSON object : View

Products Affected

sigstore

sigstore-go

CWE

CWE-347

Improper Verification of Cryptographic Signature

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