Quick answers
- Is CVE-2026-124952 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-124952 being exploited in the wild.
- How severe is CVE-2026-124952?
- Informational severity, published 10 November 2026.
- Which products and versions are affected?
- Mozilla Firefox ESR before 115.45.
- Is there a fix for CVE-2026-124952?
- Yes: fixed in Firefox ESR 115.45. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-124952 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-124952?
- Check whether you run 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 ESR 115.45
Technical details
A use-after-free flaw exists in Firefox ESR's Audio/Video component (CVE-2026-124952), allowing memory corruption when freed memory is accessed. The vulnerability requires user interaction (viewing a malicious website or playing crafted media) and can lead to information disclosure or code execution depending on exploit complexity.
Affected products
- Mozilla Firefox ESR before 115.45
Timeline
- 2026-11-10: disclosed
- 2026-11-10: patched: Fixed in Firefox ESR 115.45