Copyright © 2012 Red Hat, Inc. All rights reserved. Low 2026-06-25T14:32:49 nokogiri: rubygem-nokogiri: Nokogiri: Denial of Service due to use-after-free when replacing XML attribute values 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L CWE-825

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.

A flaw was found in Nokogiri, an XML and HTML library for Ruby. This use-after-free vulnerability occurs when replacing the value of an XML attribute. If a Ruby wrapper already points to the attribute's child node, the underlying native child node can be freed while the wrapper remains accessible. A subsequent attempt to use the freed memory or a Ruby garbage collection operation could dereference an invalid pointer, leading to an invalid read and potentially causing a segmentation fault, resulting in a Denial of Service (DoS).

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. 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. 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-2026-57435 https://nvd.nist.gov/vuln/detail/CVE-2026-57435 https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-phwj-rprq-35pp