Out-of-bounds Write Affecting Firefox-ESR package, versions [,140.7)
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-UNMANAGED-FIREFOXESR-14917175
- published13 Jan 2026
- disclosed13 Jan 2026
- creditAndrew McCreight, Dennis Jackson
Introduced: 13 Jan 2026
CVE-2026-0891 (opens in a new tab)How to fix?
Upgrade Firefox-ESR to version 140.7 or higher.
Overview
Affected versions of this package are vulnerable to Out-of-bounds Write via the memory management process. An attacker can execute arbitrary code or cause application crashes by triggering memory corruption through crafted input.