Uncontrolled Recursion in PHP - CVE-2026-91765
Published: September 24, 2026
Vulnerability identifier: #VU151926
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-91765
CWE-ID: CWE-674
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled recursion in the SOAP XML parser's cleanup_xml_node() function when handling a SOAP request containing deeply nested XML elements. A remote attacker can send a specially crafted SOAP request to cause a denial of service.
Affected software
PHP
How to mitigate CVE-2026-91765
Install security update from vendor's website.
PHP - addressed in versions 8.2.34, 8.3.35, 8.4.26, 8.5.11