CVE-2026-119132
Published:October 29, 2026
Updated:October 30, 2026
Wasmtime from 49.0.0 before 49.0.3 contains a denial-of-service vulnerability that allows a WebAssembly guest to trigger a host panic by transcoding overlapping strings in fused adapters. Attackers can make a same-instance component-to-component call transferring a string whose source and destination alias each other, crashing the host instead of raising a trap.
Affected Packages
https://github.com/bytecodealliance/wasmtime.git (GITHUB):
Affected version(s) >=v49.0.0-rc.1 <v49.0.3Fix Suggestion:
Update to version v49.0.3https://github.com/bytecodealliance/wasmtime.git (GITHUB):
Affected version(s) =v50.0.0-rc.1 <v50.0.0Fix Suggestion:
Update to version v50.0.0wasmtime-environ (RUST):
Affected version(s) =50.0.0-rc.1 <50.0.0Fix Suggestion:
Update to version 50.0.0wasmtime-environ (RUST):
Affected version(s) >=49.0.0-rc.1 <49.0.3Fix Suggestion:
Update to version 49.0.3Related Resources (2)
Do you need more information?
Contact UsCVSS v4
Base Score:
5.9
Attack Vector
NETWORK
Attack Complexity
LOW
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)
Reachable Assertion