# CVE-2026-124948: Mozilla Firefox use-after-free in Graphics component

Source: https://junglewise.ai/threats/cve-2026-124948-incorrect-boundary-conditions-use-after-free-in-the-graphics  
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-2026-124948 · Severity: info · Published 2026-11-10

Firefox is a widely-used web browser that millions rely on to access the internet safely. A use-after-free vulnerability in Firefox's Graphics component could allow an attacker to crash the browser or potentially execute arbitrary code by convincing users to visit a malicious website. This flaw affects Firefox versions prior to 160 and Firefox ESR versions prior to 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-2026-124948 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-124948 being exploited in the wild.

**How severe is CVE-2026-124948?** 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-2026-124948?** 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-2026-124948 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-124948?** 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

A use-after-free flaw exists in the Graphics component of Firefox, where memory is accessed after it has been freed. The vulnerability is triggered through web content with incorrect boundary conditions, requiring user interaction (visiting a malicious site). An attacker could crash the browser or execute arbitrary code with the privileges of the user running Firefox. The vulnerability is fixed in Firefox 160 and Firefox ESR 153.7.

## Affected products

- Mozilla Firefox before 160
- Mozilla Firefox ESR before 153.7

## Timeline

- 2026-11-10: disclosed

## References

- [https://bugzilla.mozilla.org/show_bug.cgi?id=2081960](https://bugzilla.mozilla.org/show_bug.cgi?id=2081960)
- [https://www.mozilla.org/security/advisories/mfsa2026-125/](https://www.mozilla.org/security/advisories/mfsa2026-125/)

## Related threats

- [Firefox ESR use-after-free in Audio/Video component](https://junglewise.ai/threats/cve-2026-124952-use-after-free-in-the-audio-video-component-this-vulnerability)
- [Firefox privilege escalation in Nimbus Desktop Client](https://junglewise.ai/threats/cve-2026-124951-privilege-escalation-in-the-nimbus-desktop-client-component-this)
- [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)
- [Firefox other issue in SVG component](https://junglewise.ai/threats/cve-2026-124949-other-issue-in-the-svg-component-this-vulnerability-was-fixed-in)
- [Firefox incorrect boundary conditions in Graphics component](https://junglewise.ai/threats/cve-2026-124947-incorrect-boundary-conditions-in-the-graphics-component-this)