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CVE-2026-49834

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

Published: Jul 17, 2026Updated: Jul 30, 2026 Sources: CVE List NVDCWE-347
5.9MEDIUM
NVD MITRE
EPSS Score
0.1%
Top 98.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:NI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-347

Affected Products

sigstore
oss-projectaka gitsign, rekor, cosign
sigstore-goOn-prem
Security Products / pki-crypto

Exploitability

Official Patch Available

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Collection
View detailed technique mapping

References

https://github.com/sigstore/sigstore-go/security/advisories/GHSA-9vcr-p3rj-q5q6
github.com
https://github.com/sigstore/sigstore-go/pull/633
github.com
https://github.com/sigstore/sigstore-go/commit/dbb07e62623edd5b175fb9dd5a41dcb85a159207
github.com
and 1 more references View all →

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