En bref
- CVE-2026-34983 est une vulnérabilité MOYENNE (CVSS 5.0) touchant wasmtime, wasmtime (bytecodealliance).
- Probabilité d'exploitation dans les 30 prochains jours (EPSS) : 0.12%, plus élevée que 1.6% des vulnérabilités.
- Aucune version corrigée n'est encore connue : suivez l'avis de l'éditeur dans les références.
| Package | Affected versions | Patched versions |
|---|
| wasmtime PyPI | ≤ 43.0.0
| No fix yet |
| wasmtime | = 43.0.0
| No fix yet |
Description
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.
NVD description
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.
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