CVE-2026-54787
Published:July 31, 2026
Updated:August 05, 2026
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.
Affected Packages
https://github.com/sigstore/sigstore-go.git (GITHUB):
Affected version(s) >=v0.1.0 <v1.2.1Fix Suggestion:
Update to version v1.2.1github.com/sigstore/sigstore-go (GO):
Affected version(s) >=v0.0.0-20230124120154-125800025ee9 <v1.2.1Fix Suggestion:
Update to version v1.2.1github.com/sigstore/sigstore-go (GO):
Affected version(s) >=v0.0.0-20230124120154-125800025ee9 <v1.2.1Fix Suggestion:
Update to version v1.2.1Related Resources (7)
Do you need more information?
Contact UsCVSS v4
Base Score:
2.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
3.1
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Use of a Key Past its Expiration Date
EPSS
Base Score:
0.09