Incorrect Calculation of Buffer Size Affecting wpe_webkit 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-WPEWEBKIT-14101716
- published23 Nov 2025
- disclosed20 Nov 2025
- creditGoogle Big Sleep
Introduced: 20 Nov 2025
CVE-2025-43431 (opens in a new tab)How to fix?
Upgrade wpe_webkit to version 2.50.2 or higher.
Overview
Affected versions of this package are vulnerable to Incorrect Calculation of Buffer Size a the growth mechanism in the JSObject::convertFromCopyOnWrite() and JSObject::ensureLengthSlow() functions in the JavaScriptCore runtime. An attacker can cause memory corruption by crafting web content that triggers the Butterfly memory reallocation with a 2x growth factor, leading to improper memory handling.