Low [CVE-2026-57435] Denial of Service due to use-after-free when replacing XML attribute values
This low-severity Red Hat Linux advisory covers CVE-2026-57435 affecting Red Hat 3scale API Management Platform 2, Red Hat Satellite 6.
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Summary
Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.4, Nokogiri’s CRuby native extension could leave a Ruby wrapper pointing to freed memory when replacing the value of an XML attribute.
If Ruby code had already accessed an attribute child node, Nokogiri::XML::Attr#value= could free the underlying native child node while the wrapper remained reachable through the document node cache. A later use of the freed child node or a Ruby GC mark could dereference an invalid pointer, causing an invalid read and a possible segfault.
This vulnerability is fixed in 1.19.4. The Nokogiri maintainers have evaluated this as low severity.
Reaching it requires an unusual API-usage pattern that does not arise during normal use. The application must directly access an attribute's child node and then replace that same attribute's value via Attr#value= or #content=.
Nokogiri 1.19.4 makes this pattern safe with no change to the public API. Red Hat severity: Low — CVSS 3.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L).
Weakness: CWE-825. Affected Red Hat products: Red Hat 3scale API Management Platform 2; Red Hat Satellite 6.
Red Hat does not currently list a fixing RHSA for this CVE.
- < 1.19.4
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
Mitigation checklist
- Upgrade to Nokogiri 1.19.4 or later. As a workaround, avoid accessing attribute child nodes directly via Attr#child or similar before mutating the same attribute's value.
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
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