# CVE-2026-124922: Firefox use-after-free in CSS Transitions and Animations

Source: https://junglewise.ai/threats/cve-2026-124922-use-after-free-in-the-css-transitions-and-animations-component  
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-2026-124922 · Severity: info · Published 2026-11-10

Firefox, a widely-used web browser, contains a use-after-free vulnerability in its CSS Transitions and Animations component that could allow an attacker to crash the browser or potentially execute code. An exploit would occur when a user visits a malicious webpage. This vulnerability has been fixed 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-2026-124922 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-124922 being exploited in the wild.

**How severe is CVE-2026-124922?** Informational severity, published 10 November 2026.

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

**Is there a fix for CVE-2026-124922?** 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-2026-124922 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-124922?** 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 CSS Transitions and Animations component, allowing memory safety violations when processing CSS animations or transitions. The vulnerability requires user interaction (visiting a malicious webpage) over the network. An attacker could trigger the defect to crash the browser, cause a denial of service, or potentially achieve code execution within the browser sandbox.

## Affected products

- Mozilla Firefox prior to 160
- Mozilla Firefox ESR prior to 153.7

## Timeline

- 2026-11-10: disclosed
- 2026-11-10: patched

## References

- [https://bugzilla.mozilla.org/show_bug.cgi?id=2074190](https://bugzilla.mozilla.org/show_bug.cgi?id=2074190)
- [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)
- [Mozilla Firefox use-after-free in Graphics component](https://junglewise.ai/threats/cve-2026-124948-incorrect-boundary-conditions-use-after-free-in-the-graphics)