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    <lastBuildDate>Tue, 06 Oct 2026 16:38:02 +0000</lastBuildDate>
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      <title>CVE-2026-34983 — Wasmtime has a use-after-free bug after cloning `wasmtime::Linker`</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-34983</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; bytecodealliance wasmtime&lt;/p&gt;
&lt;p&gt;Wasmtime is a runtime for WebAssembly. In 43.0.0, cloning a wasmtime::Linker is unsound and can result in use-after-free bugs. This bug is not controllable by guest Wasm programs. It can only be triggered by a specific sequence of embedder API calls made by the host. Specifically, the following steps must occur to trigger the bug clone a wasmtime::Linker, drop the original linker instance, use the new, cloned linker instance, resulting in a use-after-free. This vulnerability is fixed in 43.0.1.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; bytecodealliance wasmtime&lt;/p&gt;
&lt;p&gt;Wasmtime is a runtime for WebAssembly. In 43.0.0, cloning a wasmtime::Linker is unsound and can result in use-after-free bugs. This bug is not controllable by guest Wasm programs. It can only be triggered by a specific sequence of embedder API calls made by the host. Specifically, the following steps must occur to trigger the bug clone a wasmtime::Linker, drop the original linker instance, use the new, cloned linker instance, resulting in a use-after-free. This vulnerability is fixed in 43.0.1.&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/cve-2026-34983</guid>
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