Bug 2525152

Summary:	CVE-2026-79771 rubygem-nokogiri: Nokogiri: Denial of Service via XSLT transform memory leak [epel-all]
Product:	[Fedora] Fedora EPEL	Reporter:	Joel Chamberlain <jochambe>
Component:	rubygem-nokogiri	Assignee:	Troy Dawson <tdawson>
Status:	NEW ---	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	epel10	CC:	mtasaka, pvalena, tdawson, vondruch
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["ca5c8373-6182-490e-a40b-9e408a0d4822"]}
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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:	2523571

Description Joel Chamberlain 2026-08-27 18:25:14 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 versions before 1.19.3 contain a memory leak in the XSLT Stylesheet transform method when processing Ruby strings containing null bytes. Attackers can exploit this by passing attacker-controlled input with null bytes to transform parameters, causing heap allocations to leak and enabling denial of service against long-running processes.