CVE-2026-49834

MEDIUM

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

Title source: cna
STIX 2.1

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

CVSS v3 5.9
EPSS 0.0011
EPSS Percentile 1.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-347
Status published
Products (1)
sigstore/sigstore-go < 1.2.0 (2 CPE variants)
Published Jul 17, 2026
Tracked Since Jul 18, 2026