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CVE-2026-91765— SOAP: Unbounded Recursion in Server-Side cleanup_xml_node

Quick assessment

Affected
PHP Group PHP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SOAP XML 解析器中的 函数在每一层 XML 嵌套中递归执行一次，且未设置深度限制。未经验证的攻击者可以向任何 SoapServer 端点发送包含数万个嵌套元素的 SOAP 请求，从而耗尽栈空间并导致进程崩溃。相同的无限递归问题同样存在于 SOAP 值解码器以及 WSDL 节点搜索辅助函数中。

CVSS 7.5 · High EPSS 0.52% · P42

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth
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I. Basic Information for CVE-2026-91765

Vulnerability Information
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Vulnerability Title
SOAP: Unbounded Recursion in Server-Side cleanup_xml_node
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
PHP Group PHP 8.2.* ~ 8.2.34 -

II. Public POCs for CVE-2026-91765

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III. Intelligence Information for CVE-2026-91765

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Other References for CVE-2026-91765 (1)

Same Patch Batch · PHP Group · 2026-09-25 · 11 CVEs total

CVE-2026-17545 6.9 MEDIUM PHP on Windows: Reserved Device Names Are Not Rejected Before File/Stream I/O which can ca
CVE-2026-91767 6.5 MEDIUM Heap-buffer-overflow in php_openssl_matches_wildcard_name on crafted server cert wildcard
CVE-2026-91768 6.5 MEDIUM IPv6 ACL bypass in FastCGI listen.allowed_clients due to partial address comparison (memcm
CVE-2025-14181 6.5 MEDIUM Integer overflow to buffer overflow in soap HTTP parsing
CVE-2026-92842 5.9 MEDIUM OOB read / info leak in convert.* stream filters when line-break-chars contains NUL
CVE-2026-91766 5.9 MEDIUM Cross-origin credential leak in HTTP stream wrapper redirects
CVE-2026-93682 5.8 MEDIUM Out-of-bounds read in the HTTP stream wrapper when following a redirect with an empty Loca
CVE-2026-6103 4.3 MEDIUM Phar TAR phar_tar_number() Integer Overflow - Archive Entry Injection
CVE-2026-91769 4.3 MEDIUM TLS Hostname Verification Falls Back to CN After SAN Mismatch
CVE-2025-1218 3.4 LOW Various packet overreads in mysqlnd_writeprotocol.c

IV. Related Vulnerabilities

Same product: PHP
Same vendor: PHP Group
Same weakness: CWE-674

V. Comments for CVE-2026-91765

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