CVE-2026-17544 HIGH

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

Vendor Php Group

Product PHP

Weakness CWE-787

Published July 30, 2026

Last update July 30, 2026

View on NVD All CVEs

CVSS base score

8.1/10

Attack vector Network

Attack complexity Low

Privileges required None

User interaction None

Confidentiality —

Integrity —

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

July 30, 2026 CVE published

External resources

03References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2026-17544 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/787.html AskarLabs — CWE-787 write-up Out-of-bounds Write

Identifiers

CVE CVE-2026-17544

CWE CWE-787

CVSS 8.1 / HIGH

Affected versions

Vendor Php Group

Product PHP

Affected ≥ 8.4.* and < 8.4.24

Vendor Php Group

Product PHP

Affected ≥ 8.5.* and < 8.5.9