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CVE-2026-7259— Null pointer dereference in php_mb_check_encoding() via mb_ereg_search_init()

Quick assessment

Affected
PHP Group PHP
Exploitation
Public or AI PoC available; prioritize validation
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 8.2.31之前版本、8.3.31之前版本、8.4.21之前版本和8.5.6之前版本存在代码问题漏洞，该漏洞源于Oniguruma和mbfl之间的编码列表不匹配导致空指针取消引用，造成段错误和拒绝服务，当用户控制的输入可影响传递给mb_regex_encoding()的编码时可能被利用。

AI Predicted 7.5 Difficulty: Easy EPSS 0.34% · P26

Affected Version Matrix 4

VendorProduct Version RangeStatus
PHP Group PHP 8.2.*< 8.2.31 affected
8.3.*< 8.3.31 affected
8.4.*< 8.4.21 affected
8.5.*< 8.5.6 affected
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I. Basic Information for CVE-2026-7259

Vulnerability Information
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Vulnerability Title
Null pointer dereference in php_mb_check_encoding() via mb_ereg_search_init()
Source: CVE Program / CVE List V5
Vulnerability Description
In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, a mismatch between encoding lists in Oniguruma and mbfl leads to  a NULL pointer dereference, resulting in a segmentation fault and denial of service. The vulnerability is exploitable when user-controlled input can influence the encoding passed to mb_regex_encoding().
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/AU:Y/U:Amber
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
PHP 代码问题漏洞
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 8.2.31之前版本、8.3.31之前版本、8.4.21之前版本和8.5.6之前版本存在代码问题漏洞，该漏洞源于Oniguruma和mbfl之间的编码列表不匹配导致空指针取消引用，造成段错误和拒绝服务，当用户控制的输入可影响传递给mb_regex_encoding()的编码时可能被利用。
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 8.2.* ~ 8.2.31 -

II. Public POCs for CVE-2026-7259

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claude_code · 2212 chars
GitHub 复现环境（可 clone 直接跑）
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III. Intelligence Information for CVE-2026-7259

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Vendor Advisories for CVE-2026-7259 (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-2026-7568 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-2026-7263 DoS attack via DOMNode::C14N()
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-476

V. Comments for CVE-2026-7259

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