Vulnerability in PHP
CVE-2026-91765
cleanup_xml_node() in the SOAP XML parser recurses once per XML nesting level with no depth limit. An unauthenticated attacker can post a SOAP request containing tens of thousands of nested elements to any SoapServer endpoint, exhaust the stack and crash the process. The same unbounded recursion exists in the SOAP value decoder and in the WSDL node search helper.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (32.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 32.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.004 · change: -0.001
Affected products
Weakness classification (CWE)
References
- github.com/php/php-src/security/advisories/GHSA-rgrp-mwpx-f6rm (Exploit, vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-91765?
- CVE-2026-91765 is a high-severity vulnerability in PHP, classified under Uncontrolled Recursion. CVSS score: 7.5/10. Published 2026-09-25.
- How severe is CVE-2026-91765?
- High severity. CVSS v3 base score is 7.5 out of 10.