# CVE-2026-124926: Firefox WebRTC incorrect boundary conditions

Source: https://junglewise.ai/threats/cve-2026-124926-incorrect-boundary-conditions-in-the-webrtc-component-this  
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-2026-124926 · Severity: info · Published 2026-11-10

Firefox's WebRTC component contains an incorrect boundary conditions vulnerability that could allow attackers to cause memory corruption or crashes. This vulnerability affects users of Firefox and Firefox ESR browsers. An attacker could exploit this by crafting malicious WebRTC interactions, potentially leading to denial of service or arbitrary code execution.

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-2026-124926 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-124926 being exploited in the wild.

**How severe is CVE-2026-124926?** 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-2026-124926?** 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-2026-124926 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-124926?** 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

Incorrect boundary conditions in the WebRTC component can allow memory access beyond allocated buffers. This vulnerability is typically exploited through network-based attacks via malformed WebRTC content or signaling. The vulnerability is fixed in Firefox 160 and Firefox ESR 153.7, indicating a patch is available.

## 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=2077727](https://bugzilla.mozilla.org/show_bug.cgi?id=2077727)
- [https://www.mozilla.org/security/advisories/mfsa2026-125/](https://www.mozilla.org/security/advisories/mfsa2026-125/)

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