CVE-2026-7263: PHP

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

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.

Affected products

• PHP PHP: from 8.4.0, before 8.4.21 (fixed in 8.4.21); from 8.5.0, before 8.5.6 (fixed in 8.5.6)

Published 2026-05-10. Last modified 2026-07-24.