CVE-2026-54787
LOWsigstore-go fails to check signature timestamps against a signing key's validity period
Title source: cnaDescription
sigstore-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.
References (4)
Core 4
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/sigstore/sigstore-go/security/advisories/GHSA-wqqc-jjcq-vfxm
X_Refsource_Misc x_refsource_misc
https://github.com/sigstore/sigstore-go/pull/642
X_Refsource_Misc x_refsource_misc
https://github.com/sigstore/sigstore-go/commit/4594ab4c779d08be1f4419803a8249188f35ed5f
X_Refsource_Misc x_refsource_misc
https://github.com/sigstore/sigstore-go/releases/tag/v1.2.1
Scores
CVSS v3
3.1
EPSS
0.0009
EPSS Percentile
0.5%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-324
Status
published
Products (2)
sigstore/sigstore-go
0 - 1.2.1Go
sigstore/sigstore-go
< 1.2.1
Published
Jul 31, 2026
Tracked Since
Aug 01, 2026