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CVE-2026-7263— DoS attack via DOMNode::C14N()

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.

PHP是PHP开源的一种在服务器端执行的脚本语言。 PHP 8.4.21之前版本和8.5.6之前版本存在安全漏洞，该漏洞源于DOMNode::C14N()方法可能错误处理XML数据，导致表示XML文档的数据结构中形成循环链表，后续处理可能进入无限循环，造成拒绝服务。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.63% · P48

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 2

VendorProduct Version RangeStatus
PHP Group PHP 8.4.*< 8.4.21 affected
8.5.*< 8.5.6 affected
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I. Basic Information for CVE-2026-7263

Vulnerability Information
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Vulnerability Title
DoS attack via DOMNode::C14N()
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
不恰当的资源关闭或释放
Source: CVE Program / CVE List V5
Vulnerability Title
PHP 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PHP是PHP开源的一种在服务器端执行的脚本语言。 PHP 8.4.21之前版本和8.5.6之前版本存在安全漏洞，该漏洞源于DOMNode::C14N()方法可能错误处理XML数据，导致表示XML文档的数据结构中形成循环链表，后续处理可能进入无限循环，造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
PHP Group PHP 8.4.* ~ 8.4.21 -

II. Public POCs for CVE-2026-7263

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III. Intelligence Information for CVE-2026-7263

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Vendor Advisories for CVE-2026-7263 (1)

Same Patch Batch · PHP Group · 2026-05-10 · 10 CVEs total

CVE-2026-6722 9.5 CRITICAL Use-After-Free in SOAP using Apache map
CVE-2026-7258 Out-of-bounds read in urldecode() on NetBSD
CVE-2026-7262 NULL pointer dereference in SOAP apache:Map decoder with missing <value>
CVE-2026-7261 SoapServer session-persisted object use-after-free via SOAP header fault
CVE-2026-7259 Null pointer dereference in php_mb_check_encoding() via mb_ereg_search_init()
CVE-2026-7568 Signed integer overflow in metaphone()
CVE-2026-6735 XSS within PHP-FPM status endpoint
CVE-2025-14179 SQL injection in pdo_firebird via NUL bytes in quoted strings
CVE-2026-6104 Global buffer over-read in mb_convert_encoding() with attacker-supplied encoding

IV. Related Vulnerabilities

Same product: PHP
Same vendor: PHP Group
Same weakness: CWE-404

V. Comments for CVE-2026-7263

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