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CVE-2025-6491— NULL Pointer Dereference in PHP SOAP Extension via Large XML Namespace Prefix

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的一种在服务器端执行的脚本语言。 PHP 8.1.33之前版本、8.2.29之前版本、8.3.23之前版本和8.4.10之前版本存在安全漏洞，该漏洞源于解析XML数据时可能导致空指针取消引用，影响服务器可用性。

CVSS 5.9 · Medium EPSS 1.12% · P66

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-6491

Vulnerability Information
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Vulnerability Title
NULL Pointer Dereference in PHP SOAP Extension via Large XML Namespace Prefix
Source: CVE Program / CVE List V5
Vulnerability Description
In PHP versions:8.1.* before 8.1.33, 8.2.* before 8.2.29, 8.3.* before 8.3.23, 8.4.* before 8.4.10 when parsing XML data in SOAP extensions, overly large (>2Gb) XML namespace prefix may lead to null pointer dereference. This may lead to crashes and affect the availability of the target server.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
PHP 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PHP是PHP的一种在服务器端执行的脚本语言。 PHP 8.1.33之前版本、8.2.29之前版本、8.3.23之前版本和8.4.10之前版本存在安全漏洞，该漏洞源于解析XML数据时可能导致空指针取消引用，影响服务器可用性。
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 8.1.* ~ 8.1.33 -

II. Public POCs for CVE-2025-6491

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III. Intelligence Information for CVE-2025-6491

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Same Patch Batch · PHP Group · 2025-07-13 · 3 CVEs total

CVE-2025-1735 5.9 MEDIUM pgsql extension does not check for errors during escaping
CVE-2025-1220 3.7 LOW Null byte termination in hostnames

IV. Related Vulnerabilities

Same product: PHP
Same vendor: PHP Group
Same weakness: CWE-476