---
id: CVE-2026-7568
title: >-
  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.…
summary: >-
  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.…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-125
  - CWE-190
  - CWE-190
vendor: php
product: php
affected:
  - 'php >= 8.2.0, < 8.2.31'
  - 'php >= 8.3.0, < 8.3.31'
  - 'php >= 8.4.0, < 8.4.21'
  - 'php >= 8.5.0, < 8.5.6'
patched:
  - php 8.5.6
published: '2026-05-10'
updated: '2026-07-01'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-7568'
references:
  - url: 'https://github.com/php/php-src/security/advisories/GHSA-96wq-48vp-hh57'
    label: security@php.net
  - url: 'https://access.redhat.com/errata/RHSA-2026:22142'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:22143'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:22305'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:22649'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:23388'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:33449'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/security/cve/CVE-2026-7568'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2468566'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-7568.json
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
tags:
  - nvd
epss: 0.00455
epssPercentile: 0.38831
ingestedAt: '2026-07-01T15:50:58.831Z'
---

## Overview

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.

## Affected

- `php >= 8.2.0, < 8.2.31`
- `php >= 8.3.0, < 8.3.31`
- `php >= 8.4.0, < 8.4.21`
- `php >= 8.5.0, < 8.5.6`

## Remediation

Upgrade past the affected range:

- `php 8.5.6`