BaseFortify

Publication date: 2025-11-26

Last updated on: 2025-12-30

Assigner: CPANSec

Description

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.

CVSS Scores

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Meta Information

Published

2025-11-26

Last Modified

2025-12-30

Generated

2026-07-06

AI Q&A

2025-11-27

EPSS Evaluated

2026-07-05

NVD

CVE-2025-40934

Affected Vendors & Products

Vendor	Product	Version / Range
xml\	\	sig_project

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-347	The product does not verify, or incorrectly verifies, the cryptographic signature for data.

Attack-Flow Graph

Executive Summary

This vulnerability exists in XML-Sig Perl module versions 0.27 through 0.67, where the module incorrectly validates XML files if the signatures are omitted. Specifically, an attacker can remove the signature from an XML document, and the module will still incorrectly indicate that the signature verification passed, even though the XML file is unsigned.

Impact Analysis

This vulnerability can allow an attacker to bypass signature verification on XML files, potentially leading to acceptance of unsigned or tampered XML data as valid. This could result in unauthorized data manipulation, security breaches, or trust violations in systems relying on XML signature validation for integrity and authenticity.

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