GHSA-jpf5-526x-c5hw · Severity: medium — Perl threads have a working directory race condition where file operations may target unintended...
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
Conclusion & alert: CVE-2025-40909 is rated Low Risk (33.9/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.37%). Mandatory action: Monitor for updates and reassess as exploit intelligence or EPSS changes.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.01% | 0.37% | +0.36% |
| 2 | 2025-05-31 | — | 0.01% | — |
Full EPSS history (2 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 5.9 | 3.1 | MEDIUM |
|
2.5 | 3.4 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
GHSA-jpf5-526x-c5hw · Severity: medium — Perl threads have a working directory race condition where file operations may target unintended...
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2025-40909: 1 source package rows (perl); 56 state rows across 5 repos (3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 0, open 56. | https://security.alpinelinux.org/vuln/CVE-2025-40909 |
debian
|
not yet assigned | CVE-2025-40909 not yet assigned priority: Debian including 1 source packages (perl), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2025-40909 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2025-40909 |
suse
|
medium | CVE-2025-40909 severity moderate: SUSE including 741 source package names (0.1.6-1.2:perl-5.26.1-150300.17.20.1, 0.1.6-1.2:perl-base-5.26.1-150300.17.20.1, …), 1346 product×package rows across 350 product lines (Container bci/kiwi, Container bci/spack, … (350 product lines)): Fixed 1124, Known Affected 221, Known Not Affected 1. | https://www.suse.com/security/cve/CVE-2025-40909/ |
ubuntu
|
medium | CVE-2025-40909 medium priority: Ubuntu including 1 source packages (perl), 10 status rows across 10 suites (bionic, focal, jammy, noble, oracular, plucky, questing, trusty, upstream, xenial): needs-triage 4, released 4, ignored 1, not-affected 1. | https://ubuntu.com/security/CVE-2025-40909 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| No affected products in dataset. | |||