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Security Advisories

CVE-2026-34983

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-34983

Severity

Unknown
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Summary

Wasmtime has a use-after-free bug after cloning wasmtime::Linker

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.

References

  • https://nvd.nist.gov/vuln/detail/CVE-2026-34983
  • https://github.com/advisories/GHSA-hfr4-7c6c-48w2
  • https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34983.json
  • https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-hfr4-7c6c-48w2

Affected packages

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