High [CVE-2025-71406] Memory corruption via crafted XSLT
This high-severity Red Hat Linux advisory covers CVE-2025-71406 affecting Red Hat Hardened Images, Red Hat Satellite 6.
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Summary
Nokogiri before 1.18.4 bundles a vulnerable version of libxslt (prior to 1.1.43) that contains two use-after-free vulnerabilities: CVE-2025-24855 (use-after-free of the XPath context node due to xsltEvalXPathStringNs leaking xpathCtxt->node) and CVE-2024-55549 (use-after-free related to excluded result prefixes/namespaces).
Processing crafted XSLT can trigger memory corruption. Nokogiri 1.18.4 upgrades the bundled libxslt to 1.1.43 to resolve these issues.
This vulnerability involves a use-after-free condition that can be triggered by processing specially crafted Extensible Stylesheet Language Transformations (XSLT). A remote attacker could exploit this to cause memory corruption, potentially leading to a denial of service or other impacts.
This is an Important vulnerability. Red Hat products bundling Nokogiri versions prior to 1.18.4 are affected by use-after-free flaws in the integrated libxslt library.
Red Hat severity: Important — CVSS 7.8 (CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:H). Weakness: CWE-825.
Affected Red Hat products: Red Hat Hardened Images; Red Hat Satellite 6. Red Hat lists Red Hat 3scale API Management Platform 2; Red Hat Satellite 6 as not affected.
Red Hat fixing advisory: RHSA-2026:41276.
- < 1.18.4
- < 1.1.43
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
- libxslt-main-1.1.45-0.1.1.hum1
- RHSA-2026:41276
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
Mitigation checklist
- To reduce the risk associated with this vulnerability, ensure that applications using Nokogiri do not process untrusted Extensible Stylesheet Language Transformations (XSLT) input. Implement strict input validation and only allow XSLT from trusted sources.
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
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