CVE-2025-40909MediumCVSS 5.9
Perl threads have a working directory race condition where file operations may target unintended paths
🔗 CVE IDs covered (1)
📋 Description
Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability? One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.
🎯 Affected products4
- azl3 perl 5.38.2-509 on Azure Linux 3.0
- cbl2 perl 5.34.1-491 on CBL Mariner 2.0
- cbl2 perl 5.34.1-491 on CBL-Mariner 2.0
- cm2 perl 5.34.1-491 on CBL Mariner 2.0
✅ Remediation
KBCBL-Mariner Releases (Security Update) — fixed build 5.34.1-491 KBCBL-Mariner Releases (Security Update) — fixed build 5.38.2-509