CVE-2026-17544

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

Published Jul 30, 2026 CVSS 4.0 · 8.1 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DSA Debian DSA DSA-6406-1 php8.4 security update
Ubuntu USN Ubuntu USN USN-8743-1 PHP vulnerabilities
History
Type Values Removed Values Added
References
Metrics threat_severity

None

cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}

threat_severity

Important

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Php Group
Php Group php
Vendors & Products Php Group
Php Group php
Type Values Removed Values Added
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.
Title Out-of-bounds write in bccomp() via crafted operand and scale
Weaknesses CWE-787
References
Metrics cvssV4_0

{'score': 8.1, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
php
Published
Updated
Jul 31, 2026, 3:55 AM
Reserved
Jul 27, 2026, 10:14 AM
Status
Analyzed
Published
Jul 30, 2026, 12:17 PM
Modified
Oct 23, 2026, 10:10 PM
Severity
Important
Public date
Jul 30, 2026, 11:22 AM