Time-of-check Time-of-use (TOCTOU) Race Condition Affecting acl-dev/acl package, versions [,2.4.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-ACLDEVACL-17705244
- published30 Jun 2026
- disclosed29 Jun 2026
- creditAndrew Tridgell
Introduced: 29 Jun 2026
NewCVE-2026-54370 (opens in a new tab)How to fix?
Upgrade acl-dev/acl to version 2.4.0 or higher.
Overview
Affected versions of this package are vulnerable to Time-of-check Time-of-use (TOCTOU) Race Condition in the getfacl or setfacl process. An attacker can gain unauthorized access to files or escalate privileges by exploiting a race condition where a symbolic link replaces a pathname component between a security check and a subsequent file operation. This is only exploitable if a privileged process invokes getfacl or setfacl on an attacker-controlled path.