5.9 Medium

CVE-2026-119139 Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Host Panic via Func::call

Description

Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a leftover assertion in component::Func::call that rejects guest exports using the async ABI option. An attacker who supplies a component with an async-lifted export can crash the host process when an embedder invokes that export through Func::call.

CVSS 4.0 detail

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

Exploitable remotely over the network, with an ordinary account and if a user takes an action; an attacker can seriously compromise confidentiality, integrity or availability.

Attack vector: Network
Attack complexity: High
Attack requirements: Present
Privileges required: Low
Interaction: Passive
Confidentiality: None
Integrity: None
Availability: High
Confidentiality of other systems: None
Integrity of other systems: None
Availability of other systems: None

Affected products and versions

Product	Affected versions	Fixed in
wasmtime 49.0	49.0.0 → < 49.0.3	49.0.3
wasmtime 48.0	earliest → < 48.0.6	48.0.6
wasmtime 46.0	46.0.0 → < 48.0.6	48.0.6

References

GitHub Security Advisory (GHSA-m6w2-jwq2-cv2c) github.com
VulnCheck Advisory: Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Host Panic via Func::call www.vulncheck.com

Timeline

Published October 29, 2026
Last modified November 4, 2026

The 81 CVEs of wasmtime →

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