CVE-2026-17544

Out-of-bounds write in bccomp() via crafted operand and scale

State: Published
Severity: 8.1 High
Published: Jul 30, 2026
Updated: Jul 31, 2026
Reserved: Jul 27, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	8.1 High	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	php

Weaknesses

CWE-787 Out-of-bounds write

Affected Products

Product	Versions
PHPPHP Group	8.4.* to before 8.4.24Affected 8.5.* to before 8.5.9Affected

References

https://github.com/php/php-src/security/advisories/GHSA-x692-q9x7-8c3fvendor-advisory

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