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.
History

Thu, 11 Dec 2025 16:30:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:xmlseclibs_project:xmlseclibs:*:*:*:*:*:*:*:*

Tue, 09 Dec 2025 16:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 09 Dec 2025 10:30:00 +0000

Type Values Removed Values Added
First Time appeared Xmlseclibs Project
Xmlseclibs Project xmlseclibs
Vendors & Products Xmlseclibs Project
Xmlseclibs Project xmlseclibs

Tue, 09 Dec 2025 03:15:00 +0000

Type Values Removed Values Added
Description 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.
Title robrichards/xmlseclibs has an Libxml2 Canonicalization error which can bypass Digest/Signature validation
Weaknesses CWE-248
References
Metrics cvssV3_1

{'score': 6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:L'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2025-12-09T02:41:19.621Z

Updated: 2025-12-09T15:24:42.721Z

Reserved: 2025-12-04T18:53:42.398Z

Link: CVE-2025-66578

cve-icon Vulnrichment

Updated: 2025-12-09T15:24:35.610Z

cve-icon NVD

Status : Analyzed

Published: 2025-12-09T16:18:21.580

Modified: 2025-12-11T16:23:34.080

Link: CVE-2025-66578

cve-icon Redhat

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