Bug 2468572 (CVE-2026-7263)

Summary: CVE-2026-7263 php: denial of service via DOMNode::C14N()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in PHP. The `DOMNode::C14N()` method may incorrectly process XML data due to the improper removal of an `xmlns` attribute from the underlying libxml2 data structure, corrupting the linked list representing the XML document and causing an infinite loop. This issue can lead to excessive resource consumption, eventually resulting in a denial of service in the processing application.
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Description OSIDB Bzimport 2026-05-10 06:01:22 UTC 
In PHP versions 8.4.* before 8.4.21 and 8.5.* before 8.5.6, DOMNode::C14N() method may process the XML data incorrectly, causing a circular linked list in the data structure representing the XML document. This may cause subsequent processing of the XML document to enter infinite loop, causing denial of service in the processing application.
Comment 2 errata-xmlrpc 2026-06-02 22:08:01 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:22649 https://access.redhat.com/errata/RHSA-2026:22649