---
id: CVE-2025-1218
title: >-
  The mysqlnd wire protocol parser reads fields out of server packets before
  checking that the packet still holds enough bytes for them
summary: >-
  The mysqlnd wire protocol parser reads fields out of server packets before
  checking that the packet still holds enough bytes for them. A malicious or
  compromised MySQL server can send a truncated packet and make the client read
  past the …
severity: low
cvss: 3.4
cvssVector: 'CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N'
cwe:
  - CWE-122
  - CWE-125
vendor: PHP Group
product: ext-mysqlnd
affected:
  - ext-mysqlnd >= 8.2.* < 8.2.34
  - ext-mysqlnd >= 8.3.* < 8.3.35
  - ext-mysqlnd >= 8.4.* < 8.4.26
  - ext-mysqlnd >= 8.5.* < 8.5.11
published: '2026-09-25'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T21:17:20.993'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-1218'
references:
  - url: 'https://github.com/php/php-src/security/advisories/GHSA-r6x9-5r99-36j7'
    label: security@php.net
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-1218.json
  - url: 'https://access.redhat.com/security/cve/CVE-2025-1218'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2541655'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2025-1218'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2025-1218'
  - url: 'https://access.redhat.com/errata/RHSA-2026:70720'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ingestedAt: '2026-09-25T21:19:40.139Z'
patched:
  - hardened_images
scores:
  nvd: 3.4
  vendor: 3.7
epss: 0.00182
epssPercentile: 0.06987
---

## Overview

The mysqlnd wire protocol parser reads fields out of server packets before checking that the packet still holds enough bytes for them. A malicious or compromised MySQL server can send a truncated packet and make the client read past the end of the packet buffer, which is undefined behaviour and can crash the process.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **RHSA-2026:70720** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:70720)
- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-26 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-1218.json)