# CVE-2026-124924: Firefox Graphics: WebRender incorrect boundary conditions

Source: https://junglewise.ai/threats/cve-2026-124924-incorrect-boundary-conditions-in-the-graphics-webrender  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2026-124924 · Severity: info · Published 2026-11-10

Firefox's WebRender graphics engine contains a boundary condition vulnerability that could allow an attacker to crash the browser or potentially execute arbitrary code when rendering specially crafted web content. This affects users visiting untrusted or malicious websites. The issue was patched in Firefox 160 and Firefox ESR 153.7.

Technologies: [Mozilla Firefox](https://junglewise.ai/threats/technologies/firefox), [Mozilla Firefox ESR](https://junglewise.ai/threats/technologies/firefox-esr). Vendors: [Mozilla](https://junglewise.ai/threats/vendors/mozilla).

## Quick answers

**Is CVE-2026-124924 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-124924 being exploited in the wild.

**How severe is CVE-2026-124924?** Informational severity, published 10 November 2026.

**Which products and versions are affected?** Mozilla Firefox before 160; Mozilla Firefox ESR before 153.7.

**Is there a fix for CVE-2026-124924?** Yes: fixed in Firefox 160, Firefox ESR 153.7. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-124924 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-124924?** Check whether you run Mozilla Firefox or Mozilla Firefox ESR at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in Firefox 160, Firefox ESR 153.7

## Technical details

An incorrect boundary condition flaw exists in the Graphics: WebRender component of Firefox, a rendering engine used to display web content. The vulnerability is triggered when processing graphical elements and could lead to memory safety issues. Exploitation requires the victim to visit a malicious website, with no additional user interaction or authentication needed.

## Affected products

- Mozilla Firefox before 160
- Mozilla Firefox ESR before 153.7

## Timeline

- 2026-11-10: disclosed
- 2026-11-10: patched: Fixed in Firefox 160 and Firefox ESR 153.7

## References

- [https://bugzilla.mozilla.org/show_bug.cgi?id=2076710](https://bugzilla.mozilla.org/show_bug.cgi?id=2076710)
- [https://www.mozilla.org/security/advisories/mfsa2026-125/](https://www.mozilla.org/security/advisories/mfsa2026-125/)

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- [Firefox same-origin policy bypass in CSS Parsing and Computation](https://junglewise.ai/threats/cve-2026-124950-same-origin-policy-bypass-in-the-css-parsing-and-computation)
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- [Mozilla Firefox use-after-free in Graphics component](https://junglewise.ai/threats/cve-2026-124948-incorrect-boundary-conditions-use-after-free-in-the-graphics)