CVE-2024-3855 Affecting firefox-esr package, versions <125-r0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-CHAINGUARDLATEST-FIREFOXESR-17764051
- published1 Jul 2026
- disclosed16 Apr 2024
Introduced: 16 Apr 2024
CVE-2024-3855 (opens in a new tab)How to fix?
Upgrade Chainguard firefox-esr to version 125-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream firefox-esr package and not the firefox-esr package as distributed by Chainguard.
See How to fix? for Chainguard relevant fixed versions and status.
In certain cases the JIT incorrectly optimized MSubstr operations, which led to out-of-bounds reads. This vulnerability affects Firefox < 125.