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

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Summary

CVECVE-2026-49834
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-17 20:17:21 UTC
Updated2026-07-17 20:17:21 UTC
Descriptionsigstore-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.

Risk And Classification

Primary CVSS: v3.1 5.9 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Problem Types: CWE-347 | CWE-347 CWE-347: Improper Verification of Cryptographic Signature

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
3.1CNADECLARED5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Sigstore Sigstore-go affected < 1.2.0 Not specified

References

ReferenceSourceLinkTags
github.com/sigstore/sigstore-go/security/advisories/GHSA-9vcr-p3rj-q5q6 [email protected] github.com
github.com/sigstore/sigstore-go/commit/dbb07e62623edd5b175fb9dd5a41dcb85... [email protected] github.com
github.com/sigstore/sigstore-go/releases/tag/v1.2.0 [email protected] github.com
github.com/sigstore/sigstore-go/pull/633 [email protected] github.com
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