An update for libxml2 is now available for openEuler-24.03-LTS-SP4 Security Advisory openeuler-security@openeuler.org openEuler security committee openEuler-SA-2026-4372 Final 1.0 1.0 2026-10-16 Initial 2026-10-16 2026-10-16 openEuler SA Tool V1.0 2026-10-16 libxml2 security update An update for libxml2 is now available for openEuler-24.03-LTS-SP4 This library allows to manipulate XML files. It includes support to read, modify and write XML and HTML files. There is DTDs support this includes parsing and validation even with complex DtDs, either at parse time or later once the document has been modified. The output can be a simple SAX stream or and in-memory DOM like representations. In this case one can use the built-in XPath and XPointer implementation to select sub nodes or ranges. A flexible Input/Output mechanism is available, with existing HTTP and FTP modules and combined to an URI library. Security Fix(es): A flaw was found in libxml2. A local user or an attacker providing a specially crafted XML catalog can trigger a NULL pointer dereference during XML catalog parsing. This occurs when a `nextCatalog` element lacks its mandatory `catalog` attribute, leading to the application crashing and causing a Denial of Service (DoS).(CVE-2026-76781) In libxml2 before 2.15.4, there is a heap-based buffer overflow in xmlXPtrEvalXPtrPart because of xmlXPtrEval xpointer length saturation.(CVE-2026-86142) In xmlIO in libxml2 before 2.15.4, an inconsistency in xmlOutputWriteCallback and xmlBufUse causes negative lengths to reach write callbacks, aka a lack of a check for integer overflow before calling writecallback. This has security relevance for many types of uses of that length value within a callback.(CVE-2026-86143) In xinclude in libxml2 before 2.15.4, xmlXIncludeProcess and xmlXIncludeProcessTree do not propagate parseFlags. This has security relevance for, for example, the XML_PARSE_NONET flag, if (without it) a custom resource loader accesses the internet and triggers XML external entity injection, SSRF, or a denial of service (e.g., for an attacker-controlled internet resource that is intentionally slow).(CVE-2026-86144) An update for libxml2 is now available for openEuler-24.03-LTS-SP4. openEuler Security has rated this update as having a security impact of medium. A Common Vunlnerability Scoring System(CVSS)base score,which gives a detailed severity rating, is available for each vulnerability from the CVElink(s) in the References section. Medium libxml2 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4372 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-76781 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-86142 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-86143 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-86144 https://nvd.nist.gov/vuln/detail/CVE-2026-76781 https://nvd.nist.gov/vuln/detail/CVE-2026-86142 https://nvd.nist.gov/vuln/detail/CVE-2026-86143 https://nvd.nist.gov/vuln/detail/CVE-2026-86144 openEuler-24.03-LTS-SP4 libxml2-2.11.9-20.oe2403sp4.x86_64.rpm libxml2-debuginfo-2.11.9-20.oe2403sp4.x86_64.rpm libxml2-debugsource-2.11.9-20.oe2403sp4.x86_64.rpm libxml2-devel-2.11.9-20.oe2403sp4.x86_64.rpm python3-libxml2-2.11.9-20.oe2403sp4.x86_64.rpm libxml2-help-2.11.9-20.oe2403sp4.noarch.rpm libxml2-2.11.9-20.oe2403sp4.aarch64.rpm libxml2-debuginfo-2.11.9-20.oe2403sp4.aarch64.rpm libxml2-debugsource-2.11.9-20.oe2403sp4.aarch64.rpm libxml2-devel-2.11.9-20.oe2403sp4.aarch64.rpm python3-libxml2-2.11.9-20.oe2403sp4.aarch64.rpm libxml2-2.11.9-20.oe2403sp4.src.rpm A flaw was found in libxml2. A local user or an attacker providing a specially crafted XML catalog can trigger a NULL pointer dereference during XML catalog parsing. This occurs when a `nextCatalog` element lacks its mandatory `catalog` attribute, leading to the application crashing and causing a Denial of Service (DoS). 2026-10-16 CVE-2026-76781 openEuler-24.03-LTS-SP4 Medium 5.5 AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H libxml2 security update 2026-10-16 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4372 In libxml2 before 2.15.4, there is a heap-based buffer overflow in xmlXPtrEvalXPtrPart because of xmlXPtrEval xpointer length saturation. 2026-10-16 CVE-2026-86142 openEuler-24.03-LTS-SP4 Medium 6.9 AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L libxml2 security update 2026-10-16 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4372 In xmlIO in libxml2 before 2.15.4, an inconsistency in xmlOutputWriteCallback and xmlBufUse causes negative lengths to reach write callbacks, aka a lack of a check for integer overflow before calling writecallback. This has security relevance for many types of uses of that length value within a callback. 2026-10-16 CVE-2026-86143 openEuler-24.03-LTS-SP4 Medium 6.9 AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L libxml2 security update 2026-10-16 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4372 In xinclude in libxml2 before 2.15.4, xmlXIncludeProcess and xmlXIncludeProcessTree do not propagate parseFlags. This has security relevance for, for example, the XML_PARSE_NONET flag, if (without it) a custom resource loader accesses the internet and triggers XML external entity injection, SSRF, or a denial of service (e.g., for an attacker-controlled internet resource that is intentionally slow). 2026-10-16 CVE-2026-86144 openEuler-24.03-LTS-SP4 Medium 5.6 AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L libxml2 security update 2026-10-16 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4372