CVE-2026-54787
Low
Low
Medium
High
Critical
3.1
CVSS Score
Vulnerability Description
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.
CVSS Metrics
Common Vulnerability Scoring System
Vector String:
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
Attack Vector
N
Attack Complexity
H
Privileges Required
L
User Interaction
N
Scope
U
Confidentiality
N
Integrity
L
Availability
N
References & Resources
-
https://github.com/sigstore/sigstore-go/commit/4594ab4c779d08be1f4419803a8249188f35ed5fsecurity-advisories@github.com
-
https://github.com/sigstore/sigstore-go/pull/642security-advisories@github.com
-
https://github.com/sigstore/sigstore-go/releases/tag/v1.2.1security-advisories@github.com
-
https://github.com/sigstore/sigstore-go/security/advisories/GHSA-wqqc-jjcq-vfxmsecurity-advisories@github.com
Severity Details
3.1
out of 10.0
Low
Weakness Type (CWE)
CWE-324
Use of a Key Past its Expiration Date
- Description
- The product uses a cryptographic key or password past its expiration date, which diminishes its safety significantly by increasing the timing window for cracking attacks against that key.
- Exploit Likelihood
- Low
- Typical Severity
- High
- Abstraction Level
- Base
Key Information
- Published Date
- July 31, 2026
