CVE-2026-6104— Global buffer over-read in mb_convert_encoding() with attacker-supplied encoding
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I. Basic Information for CVE-2026-6104
Vulnerability Information
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Vulnerability Title
Global buffer over-read in mb_convert_encoding() with attacker-supplied encoding
Source: NVD (National Vulnerability Database)
Vulnerability Description
In PHP versions 8.4.* before 8.4.21 and 8.5.* before 8.5.6, when an encoding name containing an embedded NUL byte is passed to mb_convert_encoding() or related mbstring functions, the code incorrectly assumes that when strncasecmp() returns 0 it means the strings have the same length. This can lead to out-of-bounds read of global memory, potentially causing a crash or information disclosure or crash. Affected functions include mb_convert_encoding(), mb_detect_encoding(), mb_convert_variables(), and mb_detect_order(), as well as the mbstring.detect_order and mbstring.http_output INI settings.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
跨界内存读
Source: NVD (National Vulnerability Database)
Vulnerability Title
PHP 缓冲区错误漏洞
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之前版本存在缓冲区错误漏洞，该漏洞源于当包含嵌入NUL字节的编码名称传递给mb_convert_encoding()或相关mbstring函数时，代码错误地假设strncasecmp()返回0意味着字符串长度相同，可能导致全局内存越界读取，从而引发崩溃或信息泄露。以下版本受到影响：8.4.21之前版本和8.5.6之前版本。
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
II. Public POCs for CVE-2026-6104
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Same Patch Batch · PHP Group · 2026-05-10 · 10 CVEs total
| 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-2026-6722 | Use-After-Free in SOAP using Apache map | |
| 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() |
IV. Related Vulnerabilities
Same product: PHP
Same vendor: PHP Group
Same weakness: CWE-125
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Open5GS NF client.c ogs_sbi_client_send_via_scp_or_sepp out- - CVE-2026-3508
ASUS System Control Interface 缓冲区错误漏洞 - CVE-2026-8088
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V. Comments for CVE-2026-6104
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