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A code execution vulnerability exists in the WebSocket functionality of Webkit WebKitGTK 2.30.0. A specially crafted web page can trigger a use-after-free vulnerability which can lead to remote code execution. An attacker can get a user to visit a webpage to trigger this vulnerability.
Use CWE-416, Webkitgtk vendor hub and Webkitgtk product page to widen CVE-2020-13543 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2025-6558, CVE-2025-43343 and CVE-2025-43342 for nearby disclosures in the same product family.