# wasmtime (PyPI) vulnerabilities

7 known vulnerabilities (1 high, 3 medium, 3 low), with the versions each affects and the releases that fix them.

## At a glance

- Latest release: not known (cve.now hasn't read this package's releases)
- Newest unaffected release: not known without release data
- Registry: https://pypi.org/project/wasmtime/

## Advisories (7)

### [CVE-2026-34983](https://cve.now/CVE-2026-34983): Wasmtime has a use-after-free bug after cloning \`wasmtime::Linker\`

- Severity: Low 1.0
- Published: Apr 9, 2026
- Affected: through 43.0.0.

### [CVE-2024-47813](https://cve.now/CVE-2024-47813): Wasmtime race condition could lead to WebAssembly control-flow integrity and type safety violations

- Severity: Low 2.9
- Published: Oct 9, 2024
- Affected: through 19.0.0; through 19.0.1; through 19.0.2; through 20.0.0; through 20.0.1; through 20.0.2; through 21.0.0; through 21.0.1; through 22.0.0; through 23.0.0; through 23.0.1; through 23.0.2; through 24.0.0; through 25.0.0; through 25.0.1.

### [CVE-2024-30266](https://cve.now/CVE-2024-30266): Wasmtime vulnerable to panic when using a dropped extenref-typed element segment

- Severity: Low 3.3
- Published: Apr 4, 2024
- Affected: through 19.0.0.

### [CVE-2021-39218](https://cve.now/CVE-2021-39218): Out-of-bounds read/write and invalid free with \`externref\`s and GC safepoints in Wasmtime

- Severity: Medium 6.3
- Published: Sep 17, 2021
- Affected: fixed in 0.30.0; from 0.26.0, fixed in 0.30.0.

### [CVE-2021-39219](https://cve.now/CVE-2021-39219): Wrong type for \`Linker\`-define functions when used across two \`Engine\`s

- Severity: Medium 6.3
- Published: Sep 17, 2021
- Affected: fixed in 0.30.0; from 0.26.0, fixed in 0.30.0.

### [CVE-2021-39216](https://cve.now/CVE-2021-39216): Use after free passing \`externref\`s to Wasm in Wasmtime

- Severity: Medium 6.3
- Published: Sep 17, 2021
- Affected: fixed in 0.30.0; from 0.26.0, fixed in 0.30.0.

### [CVE-2021-32629](https://cve.now/CVE-2021-32629): Memory access due to code generation flaw in Cranelift module

- Severity: High 7.2
- Published: May 24, 2021
- Affected: fixed in 0.27.0.

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