CVE-2026-49834
MEDIUMsigstore-go: Multi-log threshold bypass via single compromised log
Title source: cnaDescription
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.
References (4)
Core 4
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/sigstore/sigstore-go/security/advisories/GHSA-9vcr-p3rj-q5q6
X_Refsource_Misc x_refsource_misc
https://github.com/sigstore/sigstore-go/pull/633
X_Refsource_Misc x_refsource_misc
https://github.com/sigstore/sigstore-go/commit/dbb07e62623edd5b175fb9dd5a41dcb85a159207
X_Refsource_Misc x_refsource_misc
https://github.com/sigstore/sigstore-go/releases/tag/v1.2.0
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