CVE-2026-7263

DoS attack via DOMNode::C14N()

State: Published
Severity: 6.3 Medium
Published: May 10, 2026
Updated: Jul 15, 2026
Reserved: Apr 28, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	6.3 Medium	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/AU:Y/RE:M/U:Amber	php
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	redhat-SADP

Weaknesses

CWE-404 Improper Resource Shutdown or Release
CWE-835 Loop with unreachable exit condition ('infinite loop')

Affected Products

Product	Versions
PHPPHP Group	8.4.* to before 8.4.21Affected 8.5.* to before 8.5.6Affected

References

https://github.com/php/php-src/security/advisories/GHSA-4jhr-8w89-j733vendor-advisory
https://access.redhat.com/security/cve/CVE-2026-7263vdb-entry
RHBZ#2468572issue-tracking
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-7263.json
https://access.redhat.com/errata/RHSA-2026:22649vendor-advisory

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