CVE-2025-40909

EUVD-2025-16506

30.05.2025, 13:15

Perl threads have a working directory race condition where file operations may target unintended paths.

If a directory handle is open at thread creation, the process-wide current working directory is temporarily changed in order to clone that handle for the new thread, which is visible from any third (or more) thread already running.

This may lead to unintended operations such as loading code or accessing files from unexpected locations, which a local attacker may be able to exploit.

The bug was introduced in commit 11a11ecf4bea72b17d250cfb43c897be1341861e and released in Perl version 5.13.6

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
CPANSec	CNA	5.9 MEDIUM	LOCAL	LOW	NONE	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Base Score

CVSS 3.x

EPSS Score

Percentile: Unknown

Early Detection

Affected products identified ahead of NVD analysis through intelligence sources.

Vendor	Product	Version	Source
perl	perl	5.13.6 ≤ 𝑥 < 5.41.13	CNA

Debian Releases

Debian Product

Codename

perl

bookworm	5.36.0-7+deb12u3 fixed
bookworm (security)	vulnerable
bullseye	vulnerable
bullseye (security)	5.32.1-4+deb11u5 fixed
forky	5.40.1-7 fixed
sid	5.40.1-7 fixed
trixie	5.40.1-6 fixed