CVE-2026-91765

SOAP: Unbounded Recursion in Server-Side cleanup_xml_node

Published Sep 25, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-4819-1 php8.2 security update
Debian DSA Debian DSA DSA-6514-1 php8.4 security update
Ubuntu USN Ubuntu USN USN-8936-1 PHP vulnerabilities
History
Type Values Removed Values Added
First Time appeared Php
Php php
CPEs cpe:2.3:a:php:php:*:*:*:*:*:*:*:*
Vendors & Products Php
Php php
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Php Group
Php Group php
Vendors & Products Php Group
Php Group php
Type Values Removed Values Added
First Time appeared Redhat
Redhat hummingbird
Weaknesses CWE-770
CPEs cpe:/a:redhat:hummingbird:1
Vendors & Products Redhat
Redhat hummingbird
References
Metrics threat_severity

None

threat_severity

Important

Type Values Removed Values Added
Description 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.
Title SOAP: Unbounded Recursion in Server-Side cleanup_xml_node
Weaknesses CWE-674
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
php
Published
Updated
Sep 28, 2026, 1:31 PM
Reserved
Sep 15, 2026, 12:34 AM
Status
Analyzed
Published
Sep 25, 2026, 9:17 PM
Modified
Oct 23, 2026, 1:49 PM
Severity
Important
Public date
Sep 25, 2026, 8:33 PM