Heap-based Buffer Overflow Affecting Firefox-ESR package, versions [,115.34.0)[116.0.0,140.9.0)
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.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applicationsSnyk Learn
Learn about Heap-based Buffer Overflow vulnerabilities in an interactive lesson.
Start learning- Snyk IDSNYK-UNMANAGED-FIREFOXESR-15762928
- published24 Mar 2026
- disclosed24 Mar 2026
- creditSajeeb Lohani
Introduced: 24 Mar 2026
CVE-2026-4685 (opens in a new tab)How to fix?
Upgrade Firefox-ESR to version 115.34.0, 140.9.0 or higher.
Overview
Affected versions of this package are vulnerable to Heap-based Buffer Overflow due to improper validation of boundary conditions in the Canvas2D component. An attacker can cause unexpected behavior or potentially execute arbitrary code by supplying crafted input that triggers the flaw in the rendering process.