Use After Free Affecting webkitgtk package, versions [,2.50.2)
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-WEBKITGTK-14101825
- published23 Nov 2025
- disclosed20 Nov 2025
- creditGoogle Big Sleep
Introduced: 20 Nov 2025
NewCVE-2025-43434 (opens in a new tab)How to fix?
Upgrade webkitgtk to version 2.50.2 or higher.
Overview
Affected versions of this package are vulnerable to Use After Free via unmanaged pointers to TypeDefinition in the Wasm::Global and Wasm::Table classes in the JavaScriptCore WebAssembly implementation. An attacker can cause an unexpected crash by processing maliciously crafted web content that causes exported WebAssembly globals or tables to outlive their associated Wasm instance, resulting in TypeDefinition instances being garbage-collected while the Wasm::Type fields in the globals or tables still contain dangling pointers that are dereferenced during value validation.