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CVE-2025-40934

Xml::sig vulnerability

9.3 CRITICALEPSS 0.17%
  1. Published26 Nov 2025

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityLow
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N

Affected products

Xml::sig≥ 0.27 ≤ 0.67

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2025-40934 being actively exploited?

CVE-2025-40934 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.17%.

How severe is CVE-2025-40934?

CVE-2025-40934 has a CVSS 3.1 base score of 9.3, rated critical. EPSS estimates a 0.17% probability of exploitation.

Which products are affected by CVE-2025-40934?

Affected products include Xml::sig.

How do I fix CVE-2025-40934?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-40934 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.