Vulnerability Report

CVE-2025-40934

Title: XML-Sig (Perl) improper XML file signature validation

Other

Proof Of Concept

No public PoC currently indexed for CVE-2025-40934.

CWE Category CWE-347
Published Date Nov 26, 2025
Modified Date Dec 30, 2025
Exploit Status Not Found
Score 9.3 CVSS v3.1
Exploit Probability (EPSS)
0.15%

Vulnerability Summary

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 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.

Impacted Vendors

F
file\ 1
X
xml\ 1

Reference Links

https://github.com/perl-net-saml2/perl-XML-Sig/issues/63 https://github.com/perl-net-saml2/perl-XML-Sig/pull/64
CVSS v3.1
Source Entity 134c704f-9b21-4f2e-91b3-4a467353bcc0
Severity CRITICAL
9.3
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
CHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2025-40934 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

MODIFIED

Vulnerability data or affected products updated.

MODIFIED

Vulnerability data updated via NVD.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity LOW
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N

Affected Stack

No specific products linked.