CVE-2025-40909

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.50% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 41.0% of scored records. A rank, not a probability.

NVD base score

5.9 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

NVD analysis status

Deferred. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2025-05-30 12:20Z1 YR AGO

Last updated

2026-04-18 14:15Z4 MO AGO

Reserved

2025-04-16

Assigning CNA

CPANSec

Record state

PUBLISHED

Severity

Medium (CVSS 5.9)

CNA CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Weaknesses

• CWE-426Untrusted Search PathBase
• CWE-689Permission Race Condition During Resource CopyCompound
• CWE-427Uncontrolled Search Path ElementBase

Data version

5.2

Document digest

2b5bc58b6a69fb3b8ae31521f6f892dc0117500f69b2356a4b8e3b2d3987bbc1

• github.comhttps://github.com/Perl/perl5/commit/918bfff86ca8d6d4e4ec5b30994451e0bd74aba9.patchpatch
• www.openwall.comhttps://www.openwall.com/lists/oss-security/2025/05/22/2mailing-listexploit
• github.comhttps://github.com/Perl/perl5/issues/23010issue-tracking
• bugs.debian.orghttps://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1098226related
• github.comhttps://github.com/Perl/perl5/issues/10387related
• perldoc.perl.orghttps://perldoc.perl.org/5.14.0/perl5136delta#Directory-handles-not-copied-to-threadsrelated
• github.comhttps://github.com/Perl/perl5/commit/11a11ecf4bea72b17d250cfb43c897be1341861erelated
• www.openwall.comhttp://www.openwall.com/lists/oss-security/2025/05/23/1
• www.openwall.comhttp://www.openwall.com/lists/oss-security/2025/05/30/4
• www.openwall.comhttp://www.openwall.com/lists/oss-security/2025/06/02/2
• www.openwall.comhttp://www.openwall.com/lists/oss-security/2025/06/02/5
• www.openwall.comhttp://www.openwall.com/lists/oss-security/2025/06/02/6
• www.openwall.comhttp://www.openwall.com/lists/oss-security/2025/06/02/7
• www.openwall.comhttp://www.openwall.com/lists/oss-security/2025/06/03/1
• seclists.orghttp://seclists.org/fulldisclosure/2025/Sep/55
• seclists.orghttp://seclists.org/fulldisclosure/2025/Sep/54
• seclists.orghttp://seclists.org/fulldisclosure/2025/Sep/53
• lists.debian.orghttps://lists.debian.org/debian-lts-announce/2026/04/msg00018.html