CVE-2025-40934

critical · 9.3

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 validate signatures on XML files. An unsigned XML file should return an error message. The affected versions return true when attempting to validate an XML file that contains no signatures.

9.3

CVSS

0.2%

EPSS (exploit prob.)

6th

EPSS percentile

2025-11-26

Published

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

Weaknesses

CWE-347

Affected products

Vendor	Product	Affected versions
xml::sig_project	xml::sig	>= 0.27, <= 0.67

Check a specific version with /api/v1/cve/match.

References

https://github.com/perl-net-saml2/perl-XML-Sig/issues/63
https://github.com/perl-net-saml2/perl-XML-Sig/pull/64

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2025-40934