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CVE-2025-66578

CVE-2025-66578 · robrichards/xmlseclibs has an Libxml2 Canonicalization error which can bypass Digest/Signature validation

This page contains facts from public vulnerability sources. Check the original advisory before updating.

xmlseclibs is a library written in PHP for working with XML Encryption and Signatures. Versions 3.1.3 contain an authentication bypass vulnerability due to a flaw in the libxml2 canonicalization process during document transformation. When libxml2’s canonicalization is invoked on an invalid XML input, it may return an empty string rather than a canonicalized node. xmlseclibs then proceeds to compute the DigestValue over this empty string, treating it as if canonicalization succeeded. This issue is fixed in version 3.1.4. Workarounds include treating canonicalization failures (exceptions or nil/empty outputs) as fatal and aborting validation, and/or adding explicit checks to reject when canonicalize returns nil/empty or raises errors.

CVSS 6.0 · Medium · EPSS 0.2% · Fix available

Published
Updated

Stack: php

Affected products and versions

  • xmlseclibs

    Versions
    • < 3.1.4: Affected

    No fix published

  • robrichards/xmlseclibs Packagist

    Versions
    • 1.3.2
    • 1.3.3
    • 1.3.4
    • 1.4.0
    • 1.4.1
    • 1.4.2
    • 1.4.3
    • 2.0.0
    • 2.0.1
    • 2.1.0
    • 2.1.1
    • 3.0.0
    • 3.0.1
    • 3.0.2
    • 3.0.3
    • 3.0.4
    • 3.1.0
    • 3.1.1
    • 3.1.2
    • 3.1.3
    Affected ranges
    • ECOSYSTEM: < 3.1.4

    Update to 3.1.4

Original sources

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