What is CVE-2025-40934?

CVE-2025-40934 is a critical-severity vulnerability in Timlegge Xml::sig, classified under Improper Verification of Cryptographic Signature. CVSS score: 9.3/10. Published 2025-11-26.

How severe is CVE-2025-40934?

Critical severity. CVSS v3 base score is 9.3 out of 10.

Vulnerability in Timlegge Xml::sig

CVE-2025-40934

XML-Sig versions 0.27 through 0.67 for Perl incorrectly validates XML files if signatures are omitted. An attacker can remove the signature from the XML document to make it pass the verification check. XML-Sig is a Perl module to validat…

EPSS: 0.002 (5.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N.

Affected products

Timlegge Xml::sig — versions 0.27
Xml\ \ — versions sig_project

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

9b29abf9-4ab0-4765-b253-1875cd9b441e (issue-tracking, Patch, Issue Tracking)
9b29abf9-4ab0-4765-b253-1875cd9b441e (patch, Issue Tracking)

Frequently asked questions

What is CVE-2025-40934?: CVE-2025-40934 is a critical-severity vulnerability in Timlegge Xml::sig, classified under Improper Verification of Cryptographic Signature. CVSS score: 9.3/10. Published 2025-11-26.
How severe is CVE-2025-40934?: Critical severity. CVSS v3 base score is 9.3 out of 10.