CVE-2026-54786— Wasmtime: Leak in WASIp1 `fd_renumber` implementation

Wasmtime: Leak in WASIp1 `fd_renumber` implementation

Wasmtime is a runtime for WebAssembly. All versions prior to 24.0.10; versions 25.0.0 through those before 36.0.11; versions 37.0.0 through those before 44.0.3; and versions 45.0.0 and 45.0.1 contain a native implementation of WASIp1 which suffers from a leak in the fd_renumber function where the file descriptor being renumbered to is not properly closed. Wasmtime's implementation erroneously only updated the table of descriptors for WASIp1 and didn't update the underlying table of descriptors used by the host. This behavior means that while fd_renumber works correctly from a guest's perspective it ends up leaking resources in the host that aren't cleaned up until the corresponding Store is destroyed. In a loop, guests can use fd_renumber to cause hosts to exhaust both resources and file descriptors. This bug only affects the native implementation of WASIp1, meaning that only runtimes which load core wasm modules and expose fd_renumber are affected. Runtimes are additionally only affected if they expose the ability to acquire a file descriptor, such as opening a file. For runtimes that deny access to files they are unaffected. This issue has been fixed in versions 24.0.10, 36.0.11, 44.0.3, and 45.0.2.

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对已超过有效生命周期的资源丧失索引

Bytecode Alliance wasmtime 资源管理错误漏洞

Bytecode Alliance wasmtime是Bytecode Alliance基金会开源的一个轻量级WebAssembly运行时。 Bytecode Alliance wasmtime存在资源管理错误漏洞，该漏洞源于WASIp1原生实现中fd_renumber函数对文件描述符未正确关闭，导致资源泄露，可能造成主机资源耗尽。以下版本受到影响：24.0.10之前版本、25.0.0至36.0.11之前版本、37.0.0至44.0.3之前版本、45.0.0版本和45.0.1版本。

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