Perl threads have a working directory race condition where file operations may target unintended paths
Summary
Perl threads have a working directory race condition where file operations may target unintended paths
Original description
The description as published by the source.
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
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2025-40909 perl Fixed in: 5.32.1-4+deb11u5
- Ubuntu UBUNTU-CVE-2025-40909 perl
References
- advisory github.com
- advisory nvd.nist.gov
- package github.com
- patch github.com
- patch github.com
- report github.com
- report github.com
- report openwall.com
- web seclists.org
- web seclists.org
- web seclists.org
- web openwall.com
- web openwall.com
- web openwall.com
- web openwall.com
- web openwall.com
- web openwall.com
- web openwall.com
- web bugs.debian.org
- web cpan.org
- web lists.debian.org
- web perldoc.perl.org