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CVE-2026-17544— Out-of-bounds write in bccomp() via crafted operand and scale

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 group php是php group团队开源的一种服务器端脚本语言。 php.net The PHP Interpreter 8.4.24版本之前的8.4.x版本和8.5.9版本之前的8.5.x版本存在缓冲区错误漏洞，该漏洞源于bccomp()函数对攻击者提供的输入处理不当，导致越界写入，堆栈和堆损坏。

CVSS 8.1 · High EPSS 0.42% · P36

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
PHP Group PHP 8.4.*< 8.4.24 affected
8.5.*< 8.5.9 affected
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I. Basic Information for CVE-2026-17544

Vulnerability Information
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Vulnerability Title
Out-of-bounds write in bccomp() via crafted operand and scale
Source: CVE Program / CVE List V5
Vulnerability Description
Attacker-provided inputs to bccomp() could lead to an out-of-bounds write with stack and heap corruption in PHP versions from 8.4.* before 8.4.24 and from 8.5.* before 8.5.9.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/AU:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
php.net The PHP Interpreter 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
php group php是php group团队开源的一种服务器端脚本语言。 php.net The PHP Interpreter 8.4.24版本之前的8.4.x版本和8.5.9版本之前的8.5.x版本存在缓冲区错误漏洞，该漏洞源于bccomp()函数对攻击者提供的输入处理不当，导致越界写入，堆栈和堆损坏。
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.* ~ 8.4.24 -

II. Public POCs for CVE-2026-17544

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III. Intelligence Information for CVE-2026-17544

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Vendor Advisories for CVE-2026-17544 (1)

Same Patch Batch · PHP Group · 2026-07-30 · 3 CVEs total

CVE-2026-17543 8.1 HIGH SQL injection in ext-pgsql via E'...' backslash breakout
CVE-2026-7260 5.4 MEDIUM Stack overflow in phar with circular symlinks

IV. Related Vulnerabilities

Same product: PHP
Same vendor: PHP Group
Same weakness: CWE-787