---
id: CVE-2025-66287
title: A flaw was found in WebKitGTK
summary: >-
  A flaw was found in WebKitGTK. Processing malicious web content can cause an
  unexpected process crash due to improper memory handling.
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-120
published: '2025-12-04'
updated: '2026-06-25'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-66287'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2025:22789'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:22790'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:23110'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:23433'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:23434'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:23451'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:23452'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:23583'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:23591'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:23742'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2025:23743'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2025-66287'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2418857'
    label: secalert@redhat.com
  - url: 'https://webkitgtk.org/security/WSA-2025-0009.html'
    label: secalert@redhat.com
tags:
  - nvd
epss: 0.00473
epssPercentile: 0.38203
ingestedAt: '2026-06-29T13:24:34.615Z'
---

## Overview

A flaw was found in WebKitGTK. Processing malicious web content can cause an unexpected process crash due to improper memory handling.

## Remediation

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