1. Home
  2. CVE Database
  3. CVE-2026-17544
CRITICAL · 9.8

CVE-2026-17544

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.

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.

CVSS Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH

Affected Products

VendorProductVersions
PhpPhp>= 8.4.0, < 8.4.24

Related Weaknesses (CWE)

CWE-787

References

FAQ

What is CVE-2026-17544?

CVE-2026-17544 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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.

How severe is CVE-2026-17544?

CVE-2026-17544 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-17544?

Check the references section above for vendor advisories and patch information. Affected products include: Php Php.