CVE-2025-49794
CriticalCVSS 9.1Exploitation Probability (EPSS)
Elevated risk58th percentile - higher than 58% of all known CVEs
Summary
A use-after-free vulnerability was found in libxml2 when parsing XPath elements under certain circumstances with XML schematron containing <sch:name path="..."/> elements. This flaw allows a malicious actor to craft a malicious XML document that, when processed by libxml, can cause program crashes or other undefined behaviors.
Risk Assessment
The organization faces the risk of application crashes in software using libxml2 for XML processing, potentially leading to denial of service (DoS) or other unspecified dangerous system behaviors.
Recommendation
Immediately update libxml2 to the latest patched version. Until the update is applied, avoid processing untrusted XML documents containing schematron elements.
Other vulnerabilities in libxml2
See all- CVE-2017-7013High
An issue was discovered in certain Apple products related to the 'libxml2' component. Affects iOS before 10.3.3, macOS before 10.12.6, iCloud before 6.2.2 on Windows, iTunes before 12.6.2 on Windows, tvOS before 10.2.2, and watchOS before 3.2.3.
- CVE-2017-7010High
An issue was discovered in certain Apple products related to the 'libxml2' component. It affects iOS before 10.3.3, macOS before 10.12.6, iCloud before 6.2.2 on Windows, iTunes before 12.6.2 on Windows, and tvOS before 10.2.2.
- CVE-2016-4483High
The xmlBufAttrSerializeTxtContent function in xmlsave.c in libxml2 allows context-dependent attackers to cause a denial of service (out-of-bounds read and application crash) via a non-UTF-8 attribute value, related to serialization.
- CVE-2016-4449High
CVE-2016-4449 describes an XXE vulnerability in the xmlStringLenDecodeEntities function in parser.c in libxml2 before version 2.9.4. This vulnerability, when not in validating mode, allows attackers to read arbitrary files or cause denial of service through unspecified vectors.
- CVE-2016-4447High
The xmlParseElementDecl function in libxml2 before version 2.9.4 allows context-dependent attackers to cause a denial of service via a crafted file, resulting in heap-based buffer underread and application crash.
- CVE-2016-1840High
Heap-based buffer overflow in the xmlFAParsePosCharGroup function in libxml2 before version 2.9.4 allows remote attackers to execute arbitrary code or cause a denial of service via a crafted XML document.
- CVE-2016-1835High
Use-after-free vulnerability in the xmlSAX2AttributeNs function in libxml2 before version 2.9.4, as used in Apple iOS before 9.3.2 and OS X before 10.11.5, allows remote attackers to cause a denial of service via a crafted XML document.
- CVE-2016-1834High
Heap-based buffer overflow in the xmlStrncat function in libxml2 before version 2.9.4, used in Apple iOS before 9.3.2, OS X before 10.11.5, tvOS before 9.2.1, and watchOS before 2.2.1, allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted XML document.
- CVE-2016-3705High
The xmlParserEntityCheck and xmlParseAttValueComplex functions in libxml2 2.9.3 do not properly keep track of the recursion depth, allowing context-dependent attackers to cause a denial of service via a crafted XML document containing a large number of nested entity references.
- CVE-2016-3627High
The xmlStringGetNodeList function in libxml2 version 2.9.3 and earlier, when used in recovery mode, allows context-dependent attackers to cause a denial of service through a crafted XML document, leading to infinite recursion, stack consumption, and application crash.
Original NVD description (English source)
A use-after-free vulnerability was found in libxml2. This issue occurs when parsing XPath elements under certain circumstances when the XML schematron has the <sch:name path="..."/> schema elements. This flaw allows a malicious actor to craft a malicious XML document used as input for libxml, resulting in the program's crash using libxml or other possible undefined behaviors.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS