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CVE-2025-40909

5.9 · MEDIUM

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

Published May 30, 2025CWE-426EPSS 0.50%

Overview

CVE-2025-40909 is a medium-severity vulnerability. It was published on May 30, 2025 and has a CVSS 3.1 base score of 5.9 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

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

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refbugs.debian.org/cgi-bin/bugreport.cgi?bug=1098226GitHubgithub.com/Perl/perl5/commit/11a11ecf4bea72b17d250cfb43c897be1341861eGitHubgithub.com/Perl/perl5/commit/918bfff86ca8d6d4e4ec5b30994451e0bd74aba9.patchGitHubgithub.com/Perl/perl5/issues/10387GitHubgithub.com/Perl/perl5/issues/23010Refperldoc.perl.org/5.14.0/perl5136delta#Directory-handles-not-copied-to-threadsRefwww.openwall.com/lists/oss-security/2025/05/22/2Refseclists.org/fulldisclosure/2025/Sep/53Refseclists.org/fulldisclosure/2025/Sep/54Refseclists.org/fulldisclosure/2025/Sep/55

How CyberStrike helps

Frequently asked questions

What is CVE-2025-40909?

CVE-2025-40909 is a medium-severity vulnerability. It was published on May 30, 2025 and has a CVSS 3.1 base score of 5.9 (MEDIUM).

How severe is CVE-2025-40909?

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-40909?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-40909?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-40909 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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