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CVE-2026-58592 is a dangling-reference memory-safety vulnerability in Ladybird's WebAssembly ECMAScript-module integration loader. When importing a JavaScript function into a WebAssembly module through the ESM path, a stack-local WebAssembly function-type object is retained by a host callback beyond its lifetime. The callback subsequently uses stale result-type data. This can return an empty result vector for a statically non-empty result, leaving an attacker-influenced value in a destination register. The WASM-GC array.set handler can consume that value as an object reference and convert its low bits to an array-instance pointer after only a null check, enabling an arbitrary write. The ordinary WebAssembly instantiation path, which uses a long-lived type reference, is not affected.
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A use-after-free vulnerability in the Ladybird Web Browser WebAssembly loader that can lead to code execution.
A dangling-reference use-after-lifetime flaw in Ladybird's WebAssembly ESM-integration module loader. A JavaScript function imported through the ESM path can leave a host callback referencing a destroyed stack-local FunctionType. The resulting stale type information can lead to an attacker-influenced value being consumed by WASM-GC array.set, producing an arbitrary write and potential code execution in the WebContent process from a web page.
A high-severity web-reachable code execution vulnerability in Ladybird caused by a dangling FunctionType reference in WebAssembly ESM integration, leading to stale type data, arbitrary write, and potential code execution in the WebContent process.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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