sigstore-go fails to check signature timestamps against a signing key's validity period

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-54787
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-31 23:17:25 UTC
Updated2026-08-01 00:17:17 UTC
Descriptionsigstore-go is a Go library for Sigstore signing and verification. Prior to 1.2.1, sigstore-go does not check a bundle signing timestamp against the validity window of an ExpiringKey wrapping a self-managed long-lived signing key without a certificate, which can allow an attacker holding expired key material to sign accepted bundles. This issue is fixed in version 1.2.1.

Risk And Classification

Primary CVSS: v3.1 3.1 LOW from [email protected]

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

EPSS: 0.000900000 probability, percentile 0.005580000 (date 2026-08-03)

Problem Types: CWE-324 | CWE-324 CWE-324: Use of a Key Past its Expiration Date

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary3.1LOWCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
3.1CNADECLARED3.1LOWCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Sigstore Sigstore-go affected < 1.2.1 Not specified

References

ReferenceSourceLinkTags
github.com/sigstore/sigstore-go/security/advisories/GHSA-wqqc-jjcq-vfxm 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/sigstore/sigstore-go/pull/642 [email protected] github.com
github.com/sigstore/sigstore-go/releases/tag/v1.2.1 [email protected] github.com
github.com/sigstore/sigstore-go/commit/4594ab4c779d08be1f4419803a8249188... [email protected] github.com
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