CVE-2026-119140
Published:October 29, 2026
Updated:October 30, 2026
Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a denial of service vulnerability that allows malicious components to panic the host via thread.yield in start functions. Attackers can supply a component whose start function calls an async-lowered import then thread.yield, causing an undisposed fiber drop that crashes embedders.
Affected Packages
https://github.com/bytecodealliance/wasmtime.git (GITHUB):
Affected version(s) >=v46.0.0 <v48.0.6 || >=v47.0.0 <v48.0.6 || >=v48.0.0 <v48.0.6Fix Suggestion:
Update to version v48.0.6https://github.com/bytecodealliance/wasmtime.git (GITHUB):
Affected version(s) =v50.0.0-rc.1 <v50.0.0Fix Suggestion:
Update to version v50.0.0https://github.com/bytecodealliance/wasmtime.git (GITHUB):
Affected version(s) >=v49.0.0-rc.1 <v49.0.3Fix Suggestion:
Update to version v49.0.3wasmtime (RUST):
Affected version(s) =50.0.0-rc.1 <50.0.0Fix Suggestion:
Update to version 50.0.0wasmtime (RUST):
Affected version(s) >=49.0.0-rc.1 <49.0.3Fix Suggestion:
Update to version 49.0.3wasmtime (RUST):
Affected version(s) >=46.0.0 <48.0.6 || >=47.0.0 <48.0.6 || >=48.0.0 <48.0.6Fix Suggestion:
Update to version 48.0.6Related Resources (2)
Do you need more information?
Contact UsCVSS v4
Base Score:
5.9
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
PRESENT
Privileges Required
LOW
User Interaction
PASSIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
4.8
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Incomplete Internal State Distinction
EPSS
Base Score:
0.21