Copyright © 2012 Red Hat, Inc. All rights reserved. Low 2026-06-25T14:33:29 nokogiri: rubygem-nokogiri: Nokogiri: Denial of Service via heap use-after-free 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L CWE-1287

Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.4, Nokogiri::XML::Document#root= validated only that the new root was a Nokogiri::XML::Node, allowing a DTD node to be set as the document root. The result is a heap use-after-free during garbage collection or finalization, leading to an invalid memory read or potentially a segfault. This vulnerability is fixed in 1.19.4.

A flaw was found in Nokogiri, an open-source library used for processing XML and HTML documents. This vulnerability occurs due to insufficient validation when setting the document's root element, allowing a malicious document to trigger a memory error. This can lead to a heap use-after-free, potentially causing the application to crash and resulting in a Denial of Service (DoS).

This is a flaw in Nokogiri, a Ruby library for XML and HTML processing, that can result in a denial of service. The vulnerability stems from insufficient validation when setting the document root, allowing a malicious XML document to trigger a heap use-after-free. This could lead to application crashes and impact the availability of services that process untrusted XML or HTML content using Nokogiri. This is only triggered by a programming error. Red Hat ships Nokogiri as a dependency in several products including Red Hat 3scale API Management Platform, Red Hat Satellite, and Red Hat Enterprise Linux buildroot packages. All affected product versions ship Nokogiri prior to the 1.19.4 fix. This memory-safety issue affects only the CRuby implementation (libxml2). The JRuby implementation was not affected; the same input validation was added there for behavioral parity. To mitigate this issue, applications that use Nokogiri to process untrusted XML or HTML documents should implement robust input validation and operate within a sandboxed environment. Restricting the application's ability to process arbitrary external content can reduce the risk of triggering the heap use-after-free vulnerability and prevent a denial of service. Red Hat 3scale API Management Platform 2 Fix deferred 3scale-amp21/backend Red Hat 3scale API Management Platform 2 Fix deferred 3scale-amp21/system Red Hat 3scale API Management Platform 2 Fix deferred 3scale-amp21/zync Red Hat 3scale API Management Platform 2 Fix deferred 3scale-amp22/backend Red Hat 3scale API Management Platform 2 Fix deferred 3scale-amp22/system Red Hat 3scale API Management Platform 2 Fix deferred 3scale-amp22/zync Red Hat 3scale API Management Platform 2 Fix deferred 3scale-amp26/toolbox Red Hat 3scale API Management Platform 2 Fix deferred 3scale-amp2/backend-rhel8 Red Hat 3scale API Management Platform 2 Fix deferred 3scale-amp2/system-rhel7 Red Hat 3scale API Management Platform 2 Fix deferred 3scale-amp2/system-rhel8 Red Hat 3scale API Management Platform 2 Fix deferred 3scale-amp2/system-rhel9 Red Hat 3scale API Management Platform 2 Fix deferred 3scale-amp2/toolbox-rhel8 Red Hat 3scale API Management Platform 2 Fix deferred 3scale-amp2/toolbox-rhel9 Red Hat 3scale API Management Platform 2 Fix deferred 3scale-amp2/zync-rhel8 Red Hat 3scale API Management Platform 2 Fix deferred 3scale-amp2/zync-rhel9 Red Hat Satellite 6 Fix deferred rubygem-nokogiri Red Hat Satellite 6 Fix deferred satellite:el8/rubygem-nokogiri https://www.cve.org/CVERecord?id=CVE-2026-57436 https://nvd.nist.gov/vuln/detail/CVE-2026-57436 https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-wjv4-x9w8-wm3h