3.1

CVE-2026-54787: sigstore-go fails to check signature timestamps against a signing key's validity period

Awaiting analysis
AliasesUBUNTU-CVE-2026-54787DEBIAN-CVE-2026-54787CGA-246h-254j-gwqq
Published 31-07-2026Last modified 31-07-2026

Vulnerability summary

CVE-2026-54787 is a low (CVSS 3.1) Use of a Key Past its Expiration Date vulnerability in sigstore sigstore-go. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.8% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 3.1, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
3.1/10
010
Low · v3.1 (CVE.org)
EPSS score
0.13%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 6 · Related 3
OPENSUSE-SU-2026:21761-1RHSA-2026:44162RHSA-2026:44451RHSA-2026:47889RHSA-2026:47891SUSE-SU-2026:23625-1

Timeline

  1. 31-07-2026
    PublishedVulnerability first disclosed.
  2. 31-07-2026
    Last modifiedVulnerability information updated.

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

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.13% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard163 products
  • aactl< 0.4.12-r67
  • cloudbeat-9.3< 9.3.8-r2
  • cloudbeat-9.4< 9.4.4-r2
  • cloudbeat-fips-9.3< 9.3.8-r2
  • cloudbeat-fips-9.4< 9.4.4-r2
Wolfi37 products
  • aactl< 0.4.12-r67
  • crossplane-2.1< 2.1.8-r2
  • crossplane-2.2< 2.2.4-r2
  • crossplane-2.2-crank< 2.2.4-r2
  • falcoctl< 0.13.0-r17

2 vendors · 200 products · Showing 200 of 207

References

10 links