Bug 2497303

Summary:	CVE-2026-57436 rubygem-nokogiri: Nokogiri: Denial of Service via heap use-after-free [epel-all]
Product:	[Fedora] Fedora EPEL	Reporter:	Vipul Nair <vinair>
Component:	rubygem-nokogiri	Assignee:	Troy Dawson <tdawson>
Status:	NEW ---	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	low	Docs Contact:
Priority:	low
Version:	epel10	CC:	mtasaka, pvalena, tdawson, vondruch
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["82cf4f50-743c-46b3-956b-1e41727bb78e"]}
Fixed In Version:		Doc Type:	---
Doc Text:		Story Points:	---
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Documentation:	---	CRM:
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2492937

Description Vipul Nair 2026-07-06 09:21:25 UTC

Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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.