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CVE-2026-34983

CVE-2026-34983 · Wasmtime has a use-after-free bug after cloning `wasmtime::Linker`

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 1.0 · Low · EPSS 0.1% · Fix available

Published
Updated

Stack: system · python

Affected products and versions

  • wasmtime

    Versions
    • >= 43.0.0, < 43.0.1: Affected

    No fix published

  • rust-wasmtime Debian:13

    Versions
    • 26.0.1+dfsg-10
    • 26.0.1+dfsg-3
    • 26.0.1+dfsg-4
    • 26.0.1+dfsg-5
    • 26.0.1+dfsg-6
    • 26.0.1+dfsg-7
    • 26.0.1+dfsg-8
    • 26.0.1+dfsg-9
    • 27.0.0+dfsg-2
    • 27.0.0+dfsg-3
    • 27.0.0+dfsg-4
    • 28.0.1+dfsg-1
    • 28.0.1+dfsg-2
    • 28.0.1+dfsg-3
    • 29.0.1+dfsg-1
    • 29.0.1+dfsg-2
    • 29.0.1+dfsg-3
    • 29.0.1+dfsg-4
    • 29.0.1+dfsg-5
    • 29.0.1+dfsg-6
    • 29.0.1+dfsg-7
    • 29.0.1+dfsg-8
    • 36.0.11+dfsg-1
    • 36.0.12+dfsg-1
    • 36.0.12+dfsg-2
    • 36.0.12+dfsg-3
    • 36.0.13+dfsg-1
    • 36.0.5+dfsg-1
    • 36.0.5+dfsg-2
    • 36.0.5+dfsg-3
    • 36.0.5+dfsg-4
    • 36.0.5+dfsg-5
    • 36.0.6+dfsg-1
    • 36.0.6+dfsg-2
    • 36.0.6+dfsg-3
    • 36.0.6+dfsg-4
    • 36.0.6+dfsg-5
    • 36.0.6+dfsg-6
    • 36.0.6+dfsg-7
    • 36.0.7+dfsg-1
    • 36.0.8+dfsg-1
    • 36.0.9+dfsg-1
    • 36.0.9+dfsg-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rust-wasmtime Debian:14

    Versions
    • 26.0.1+dfsg-10
    • 26.0.1+dfsg-3
    • 26.0.1+dfsg-4
    • 26.0.1+dfsg-5
    • 26.0.1+dfsg-6
    • 26.0.1+dfsg-7
    • 26.0.1+dfsg-8
    • 26.0.1+dfsg-9
    • 27.0.0+dfsg-2
    • 27.0.0+dfsg-3
    • 27.0.0+dfsg-4
    • 28.0.1+dfsg-1
    • 28.0.1+dfsg-2
    • 28.0.1+dfsg-3
    • 29.0.1+dfsg-1
    • 29.0.1+dfsg-2
    • 29.0.1+dfsg-3
    • 29.0.1+dfsg-4
    • 29.0.1+dfsg-5
    • 29.0.1+dfsg-6
    • 29.0.1+dfsg-7
    • 29.0.1+dfsg-8
    • 36.0.5+dfsg-1
    • 36.0.5+dfsg-2
    • 36.0.5+dfsg-3
    • 36.0.5+dfsg-4
    • 36.0.5+dfsg-5
    • 36.0.6+dfsg-1
    • 36.0.6+dfsg-2
    • 36.0.6+dfsg-3
    • 36.0.6+dfsg-4
    • 36.0.6+dfsg-5
    • 36.0.6+dfsg-6
    • 36.0.6+dfsg-7
    Affected ranges
    • ECOSYSTEM: < 36.0.7+dfsg-1

    Update to 36.0.7+dfsg-1

  • wasmtime PyPI

    Versions
    • 0.0.1
    • 0.0.2
    • 0.11.0
    • 0.12.0
    • 0.15.0
    • 0.15.1
    • 0.16.0
    • 0.16.1
    • 0.17.0
    • 0.18.0
    • 0.18.1
    • 0.18.2
    • 0.19.0
    • 0.20.0
    • 0.21.0
    • 0.22.0
    • 0.23.0
    • 0.24.0
    • 0.25.0
    • 0.26.0
    • 0.27.0
    • 0.28.0
    • 0.28.1
    • 0.29.0
    • 0.30.0
    • 0.31.0
    • 0.32.0
    • 0.33.0
    • 0.34.0
    • 0.35.0
    • 0.36.0
    • 0.37.0
    • 0.38.0
    • 0.39.1
    • 0.40.0
    • 0.9.0
    • 1.0.0
    • 1.0.1
    • 10.0.0
    • 10.0.1
    • 11.0.0
    • 12.0.0
    • 13.0.0
    • 13.0.1
    • 13.0.2
    • 14.0.0
    • 15.0.0
    • 16.0.0
    • 17.0.0
    • 17.0.1
    • 18.0.0
    • 18.0.2
    • 19.0.0
    • 2.0.0
    • 20.0.0
    • 21.0.0
    • 22.0.0
    • 23.0.0
    • 24.0.0
    • 25.0.0
    • 27.0.0
    • 27.0.1
    • 27.0.2
    • 28.0.0
    • 29.0.0
    • 3.0.0
    • 30.0.0
    • 31.0.0
    • 32.0.0
    • 33.0.0
    • 34.0.0
    • 35.0.0
    • 36.0.0
    • 37.0.0
    • 38.0.0
    • 39.0.0
    • 4.0.0
    • 40.0.0
    • 41.0.0
    • 42.0.0
    • 43.0.0
    • 5.0.0
    • 6.0.0
    • 7.0.0
    • 8.0.0
    • 8.0.1
    • 9.0.0
    Affected ranges
    • ECOSYSTEM: ≤ 43.0.0

    No fix published

  • rust-wasmtime Ubuntu:24.04:LTS

    Versions
    • 10.0.1+dfsg-7
    • 15.0.1+dfsg-4
    • 16.0.0+dfsg-2
    • 16.0.0+dfsg-3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rust-wasmtime Ubuntu:25.10

    Versions
    • 26.0.1+dfsg-3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rust-wasmtime Ubuntu:26.10

    Versions
    • 36.0.5+dfsg-1
    • 36.0.13+dfsg-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • rust-wasmtime Ubuntu:26.04:LTS

    Versions
    • 26.0.1+dfsg-3
    • 26.0.1+dfsg-4
    • 28.0.1+dfsg-3
    • 29.0.1+dfsg-5
    • 36.0.5+dfsg-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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