Summary
The libxml2 library is a development toolbox providing the implementation of various XML standards.
Security Fix(es):
* libxml: Heap use after free (UAF) leads to Denial of service (DoS) (CVE-2025-49794)
* libxml: Type confusion leads to Denial of service (DoS) (CVE-2025-49796)
* libxml2: Integer Overflow in xmlBuildQName() Leads to Stack Buffer Overflow in libxml2 (CVE-2025-6021)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Fixed packages 3
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux · 8 | libxml2 | 2.9.7-21.el8_10.1 |
| AlmaLinux · 8 | libxml2-devel | 2.9.7-21.el8_10.1 |
| AlmaLinux · 8 | python3-libxml2 | 2.9.7-21.el8_10.1 |
Vulnerabilities 3
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Critical 9.1
Libxml: heap use after free (uaf) leads to denial of service (dos)
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 …
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Critical 9.1
Libxml: type confusion leads to denial of service (dos)
A vulnerability was found in libxml2. Processing certain sch:name elements from the input XML file can trigger a memory corruption issue. This flaw allows an attacker to craft a malicious XML input file that can lead libxml to crash, resulting in a denial of …
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High 7.5
Libxml2: integer overflow in xmlbuildqname() leads to stack buffer overflow in libxml2
A flaw was found in libxml2's xmlBuildQName function, where integer overflows in buffer size calculations can lead to a stack-based buffer overflow. This issue can result in memory corruption or a denial of service when processing crafted input.
References
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report
https://access.redhat.com/security/cve/CVE-2025-49794
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report
https://access.redhat.com/security/cve/CVE-2025-49796
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report
https://access.redhat.com/security/cve/CVE-2025-6021
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report
https://bugzilla.redhat.com/2372373
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report
https://bugzilla.redhat.com/2372385
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report
https://bugzilla.redhat.com/2372406
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advisory
https://errata.almalinux.org/8/ALSA-2025-10698.html