CVE-2026-7568

CVE Details

Release Date:	2026-05-10
Impact:	Important	What is this?

Description

In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, the metaphone() function in ext/standard/metaphone.c uses a signed int variable to track the current position within the input string. If a string longer than 2,147,483,647 bytes is passed, a signed integer overflow occurs, resulting in undefined behavior. This can lead to an out-of-bounds read, causing a segmentation fault or access to unrelated memory, and may affect the availability of the PHP process.

See more information about CVE-2026-7568 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	7.5
Vector String:	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Version:	3.1
Attack Vector:	Network
Attack Complexity:	Low
Privileges Required:	None
User Interaction:	None
Scope:	Unchanged
Confidentiality Impact:	None
Integrity Impact:	None
Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 8 (libzip)	ELSA-2026-22305	2026-06-03
Oracle Linux version 8 (php)	ELSA-2026-22305	2026-06-03
Oracle Linux version 8 (php-pear)	ELSA-2026-22305	2026-06-03
Oracle Linux version 8 (php-pecl-apcu)	ELSA-2026-22305	2026-06-03
Oracle Linux version 8 (php-pecl-rrd)	ELSA-2026-22305	2026-06-03
Oracle Linux version 8 (php-pecl-xdebug3)	ELSA-2026-22305	2026-06-03
Oracle Linux version 8 (php-pecl-zip)	ELSA-2026-22305	2026-06-03