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

Quick assessment

Affected
robrichards xmlseclibs
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Xmlseclibs是一个用 PHP 编写的库，用于处理 XML 加密和签名。 Xmlseclibs 3.1.3版本存在安全漏洞，该漏洞源于libxml2规范化过程存在缺陷，可能导致身份验证绕过。

CVSS 6.0 · Medium EPSS 0.24% · P16

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-66578

Vulnerability Information
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Vulnerability Title
robrichards/xmlseclibs has an Libxml2 Canonicalization error which can bypass Digest/Signature validation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未捕获的异常
Source: CVE Program / CVE List V5
Vulnerability Title
Xmlseclibs 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Xmlseclibs是一个用 PHP 编写的库，用于处理 XML 加密和签名。 Xmlseclibs 3.1.3版本存在安全漏洞，该漏洞源于libxml2规范化过程存在缺陷，可能导致身份验证绕过。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
robrichards xmlseclibs < 3.1.4 -

II. Public POCs for CVE-2025-66578

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III. Intelligence Information for CVE-2025-66578

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Patches & Fixes for CVE-2025-66578 (1)

Other References for CVE-2025-66578 (1)

IV. Related Vulnerabilities

Same product: xmlseclibs
Same vendor: robrichards
Same weakness: CWE-248

V. Comments for CVE-2025-66578

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