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.

An update of the rubygem package has been released.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-57435)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
325379	Photon OS 4.0: Rubygem PHSA-2026-4.0-1051	Nessus	PhotonOS Local Security Checks	medium
324558	Photon OS 5.0: Rubygem PHSA-2026-5.0-0911	Nessus	PhotonOS Local Security Checks	medium
323618	Linux Distros Unpatched Vulnerability : CVE-2026-57435	Nessus	Misc.	medium

Detections

Analytics

CVE-2026-57435

medium

Tenable Plugins

medium

medium

medium