Bug 2523571 (CVE-2026-79771)

Summary: CVE-2026-79771 nokogiri: Nokogiri: Denial of Service via XSLT transform memory leak
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: akostadi, amasferr, anthomas, crizzo, dmayorov, ehelms, eshamard, ggainey, grannygame.org, jlledo, jpasqual, juwatts, jvasik, kaycoth, mdellweg, mhulan, nmoumoul, osousa, pantinor, pcreech, rblanco, rchan, smallamp, tmalecek, tsedmik
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Doc Text:
A flaw was found in Nokogiri. Attackers can exploit a memory leak in the XSLT Stylesheet transform method by providing specially crafted input containing null bytes. This can lead to excessive memory consumption and enable a denial of service against long-running processes.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On: 2525152, 2525150    
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Description OSIDB Bzimport 2026-08-25 15:35:08 UTC 
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.
Comment 3 Octavia 2026-09-09 03:05:07 UTC 
The Nokogiri XSLT ( https://amonggame.org ) memory leak is a significant security concern, so tracking the affected versions and available fixes should be a priority to prevent potential denial-of-service issues.