Use of Uninitialized Variable Affecting Firefox package, versions [,147.0.0)
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.
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Test your applications- Snyk IDSNYK-UNMANAGED-FIREFOX-14917197
- published13 Jan 2026
- disclosed13 Jan 2026
- creditElysee Franchuk
Introduced: 13 Jan 2026
CVE-2026-0889 (opens in a new tab)How to fix?
Upgrade Firefox to version 147.0.0 or higher.
Overview
Affected versions of this package are vulnerable to Use of Uninitialized Variable via the Service Workers process. An attacker can cause the application to become unresponsive or crash by sending specially crafted requests to the affected component.