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CVE-2025-40934

9.3 · CRITICAL

XML-Sig versions 0.27 through 0.67 for Perl incorrectly validates XML files if signatures are omitted.

Published Nov 26, 2025CWE-347EPSS 0.17%

Overview

CVE-2025-40934 is a critical-severity vulnerability. It was published on November 26, 2025 and has a CVSS 3.1 base score of 9.3 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.3, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/perl-net-saml2/perl-XML-Sig/issues/63GitHubgithub.com/perl-net-saml2/perl-XML-Sig/pull/64

How CyberStrike helps

Frequently asked questions

What is CVE-2025-40934?

CVE-2025-40934 is a critical-severity vulnerability. It was published on November 26, 2025 and has a CVSS 3.1 base score of 9.3 (CRITICAL).

How severe is CVE-2025-40934?

This vulnerability has a CVSS 3.1 base score of 9.3, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-40934?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-40934?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-40934 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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