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CVE-2026-58592 is a memory-safety vulnerability in the Ladybird browser’s WebAssembly ESM-integration module loader. When a JavaScript function is imported into a WebAssembly module through the ESM path, WebAssemblyModule.cpp passes a stack-local Wasm::FunctionType by reference to create_host_function. The resulting host callback captures that reference and later dereferences it after the ESM link-loop iteration has ended and the original FunctionType object has been destroyed, creating a dangling reference. The stale type information can cause the callback to return an empty result vector where a statically non-empty result is expected, leaving an attacker-influenced value in the destination register. That value is then consumed by the WASM-GC array.set handler, which bit-casts the low bits of the reference into an ArrayInstance pointer after only a null check, enabling an arbitrary write. The normal instantiate path uses a long-lived reference and is not affected. The issue is reachable from malicious HTML content and can be chained to code execution in the WebContent process.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A use-after-free vulnerability in the Ladybird Web Browser WebAssembly loader that can lead to code execution.
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.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.