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bytecodealliance / wasmtime CVEs

Beta · best-effort

41 CVEs tagged to bytecodealliance / wasmtime3 Critical, 3 High, 21 Medium, 14 Low, 0 Unrated.

CVE-2026-54786

Published Jul 1, 2026

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…

CVSS 2.3 · Low
evidence mentions
1
Buzz score
11.9
Vendor/product tagsBeta · best-effort

CVE-2026-47261

Published Jun 15, 2026

Wasmtime is a runtime for WebAssembly. In versions prior to 24.0.9, 36.0.10, and 44.0.2, when a filesystem preopen is given DirPerms::all() and FilePerms::READ without FilePerms::…

CVSS 7.5 · High
evidence mentions
5
Buzz score
22.9
Vendor/product tagsBeta · best-effort

CVE-2026-44216

Published May 14, 2026

Wasmtime is a runtime for WebAssembly. From 30.0.0 to 36.0.8, 43.0.2, and 44.0.1, Wasmtime's allocation logic for a WebAssembly table contained checked arithmetic which panicked o…

CVSS 5.9 · Medium
evidence mentions
6
Buzz score
32.5
Vendor/product tagsBeta · best-effort

CVE-2026-35195

Published Apr 9, 2026

Wasmtime is a runtime for WebAssembly. Prior to 24.0.7, 36.0.7, 42.0.2, and 43.0.1, Wasmtime's implementation of transcoding strings between components contains a bug where the re…

CVSS 6.1 · Medium
evidence mentions
1
Buzz score
11.9
Vendor/product tagsBeta · best-effort

CVE-2026-35186

Published Apr 9, 2026

Wasmtime is a runtime for WebAssembly. From 25.0.0 to before 36.0.7, 42.0.2, and 43.0.1, Wasmtime's Winch compiler backend contains a bug where translating the table.grow operator…

CVSS 6.1 · Medium
evidence mentions
1
Buzz score
11.9
Vendor/product tagsBeta · best-effort

CVE-2026-34988

Published Apr 9, 2026

Wasmtime is a runtime for WebAssembly. From 28.0.0 to before 36.0.7, 42.0.2, and 43.0.1, Wasmtime's implementation of its pooling allocator contains a bug where in certain configu…

CVSS 2.3 · Low
evidence mentions
1
Buzz score
11.9
Vendor/product tagsBeta · best-effort

CVE-2026-34987

Published Apr 9, 2026

Wasmtime is a runtime for WebAssembly. From 25.0.0 to before 36.0.7, 42.0.2, and 43.0.1, Wasmtime with its Winch (baseline) non-default compiler backend may allow properly constru…

CVSS 9.0 · Critical
evidence mentions
1
Buzz score
11.9
Vendor/product tagsBeta · best-effort

CVE-2026-34983

Published Apr 9, 2026

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.…

CVSS 1.0 · Low
evidence mentions
1
Buzz score
11.9
Vendor/product tagsBeta · best-effort

CVE-2026-34971

Published Apr 9, 2026

Wasmtime is a runtime for WebAssembly. From 32.0.0 to before 36.0.7, 42.0.2, and 43.0.1, Wasmtime's Cranelift compilation backend contains a bug on aarch64 when performing a certa…

CVSS 9.0 · Critical
evidence mentions
4
Buzz score
29.1
Vendor/product tagsBeta · best-effort

CVE-2026-34946

Published Apr 9, 2026

Wasmtime is a runtime for WebAssembly. From 25.0.0 to before 36.0.7, 42.0.2, and 43.0.1, Wasmtime's Winch compiler contains a vulnerability where the compilation of the table.fill…

CVSS 5.9 · Medium
evidence mentions
1
Buzz score
11.9
Vendor/product tagsBeta · best-effort

CVE-2026-34945

Published Apr 9, 2026

Wasmtime is a runtime for WebAssembly. From 25.0.0 to before 36.0.7, 42.0.2, and 43.0.1, Wasmtime's Winch compiler contains a bug where a 64-bit table, part of the memory64 propos…

CVSS 2.3 · Low
evidence mentions
1
Buzz score
11.9
Vendor/product tagsBeta · best-effort

CVE-2026-34944

Published Apr 9, 2026

Wasmtime is a runtime for WebAssembly. Prior to 24.0.7, 36.0.7, 42.0.2, and 43.0.1, On x86-64 platforms with SSE3 disabled Wasmtime's compilation of the f64x2.splat WebAssembly in…

CVSS 4.1 · Medium
evidence mentions
1
Buzz score
11.9
Vendor/product tagsBeta · best-effort

CVE-2026-34943

Published Apr 9, 2026

Wasmtime is a runtime for WebAssembly. Prior to 24.0.7, 36.0.7, 42.0.2, and 43.0.1, Wasmtime contains a possible panic which can happen when a flags-typed component model value is…

CVSS 5.6 · Medium
evidence mentions
1
Buzz score
11.9
Vendor/product tagsBeta · best-effort

CVE-2026-34942

Published Apr 9, 2026

Wasmtime is a runtime for WebAssembly. Prior to 24.0.7, 36.0.7, 42.0.2, and 43.0.1, Wasmtime's implementation of transcoding strings into the Component Model's utf16 or latin1+utf…

CVSS 5.9 · Medium
evidence mentions
1
Buzz score
11.9
Vendor/product tagsBeta · best-effort

CVE-2026-34941

Published Apr 9, 2026

Wasmtime is a runtime for WebAssembly. Prior to 24.0.7, 36.0.7, 42.0.2, and 43.0.1, Wasmtime contains a vulnerability where when transcoding a UTF-16 string to the latin1+utf16 co…

CVSS 6.9 · Medium
evidence mentions
1
Buzz score
11.9
Vendor/product tagsBeta · best-effort

CVE-2026-27572

Published Feb 24, 2026

Wasmtime is a runtime for WebAssembly. Prior to versions 24.0.6, 36.0.6, 4.0.04, 41.0.4, and 42.0.0, Wasmtime's implementation of the `wasi:http/types.fields` resource is suscepti…

CVSS 6.9 · Medium
evidence mentions
7
Buzz score
30.8
Vendor/product tagsBeta · best-effort

CVE-2026-27204

Published Feb 24, 2026

Wasmtime is a runtime for WebAssembly. Prior to versions 24.0.6, 36.0.6, 4.0.04, 41.0.4, and 42.0.0, Wasmtime's implementation of WASI host interfaces are susceptible to guest-con…

CVSS 6.9 · Medium
evidence mentions
7
Buzz score
35.8
Vendor/product tagsBeta · best-effort

CVE-2026-27195

Published Feb 24, 2026

Wasmtime is a runtime for WebAssembly. Starting with Wasmtime 39.0.0, the `component-model-async` feature became the default, which brought with it a new implementation of `[Typed…

CVSS 6.9 · Medium
evidence mentions
6
Buzz score
29.5
Vendor/product tagsBeta · best-effort

CVE-2026-24116

Published Jan 27, 2026

Wasmtime is a runtime for WebAssembly. Starting in version 29.0.0 and prior to version 36.0.5, 40.0.3, and 41.0.1, on x86-64 platforms with AVX, Wasmtime's compilation of the `f64…

CVSS 4.1 · Medium
evidence mentions
8
Buzz score
38.5
Vendor/product tagsBeta · best-effort

CVE-2025-62711

Published Oct 24, 2025

Wasmtime is a runtime for WebAssembly. In versions from 38.0.0 to before 38.0.3, the implementation of component-model related host-to-wasm trampolines in Wasmtime contained a bug…

CVSS 2.1 · Low
Vendor/product tagsBeta · best-effort

CVE-2025-61670

Published Oct 7, 2025

Wasmtime is a runtime for WebAssembly. Wasmtime 37.0.0 and 37.0.1 have memory leaks in the C/C++ API when using bindings for the `anyref` or `externref` WebAssembly values. This i…

CVSS 1.0 · Low
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CVE-2025-53901

Published Jul 18, 2025

Wasmtime is a runtime for WebAssembly. Prior to versions 24.0.4, 33.0.2, and 34.0.2, a bug in Wasmtime's implementation of the WASIp1 set of import functions can lead to a WebAsse…

CVSS 3.5 · Low
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CVE-2024-51745

Published Nov 5, 2024

Wasmtime is a fast and secure runtime for WebAssembly. Wasmtime's filesystem sandbox implementation on Windows blocks access to special device filenames such as "COM1", "COM2", "L…

CVSS 2.3 · Low
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CVE-2024-47813

Published Oct 9, 2024

Wasmtime is an open source runtime for WebAssembly. Under certain concurrent event orderings, a `wasmtime::Engine`'s internal type registry was susceptible to double-unregistratio…

CVSS 2.9 · Low
Vendor/product tagsBeta · best-effort

CVE-2024-47763

Published Oct 9, 2024

Wasmtime is an open source runtime for WebAssembly. Wasmtime's implementation of WebAssembly tail calls combined with stack traces can result in a runtime crash in certain WebAsse…

CVSS 5.5 · Medium
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