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.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published Record updated
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.
Is CVE-2026-57435 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-57435 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-57435?
Upgrade to a fixed release named by Red Hat:
- 1.19.4
Confirm against the vendor advisory before you patch.
- < 1.19.4
Official advisory · high-confidence parse· fetched 16 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 16 days ago·verify at source
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