CVE-2026-115892
Published:October 23, 2026
Updated:October 27, 2026
Wasmtime is a runtime for WebAssembly. From 46.0.0 until 48.0.7 and 49.0.4, lowering a host-created component-model stream or future into a guest can omit a required payload-type check after the value passes through guest code and returns through StreamAny, FutureAny, Val::Stream, Val::Future, or an equivalent typed reader. A malicious guest that controls exported function types or returned values can cause the host to pass the type-erased value to a guest expecting a different payload type, which panics the Wasmtime host. This issue is fixed in versions 48.0.7 and 49.0.4.
Affected Packages
https://github.com/bytecodealliance/wasmtime.git (GITHUB):
Affected version(s) >=v48.0.0 <v48.0.7Fix Suggestion:
Update to version v48.0.7https://github.com/bytecodealliance/wasmtime.git (GITHUB):
Affected version(s) >=v49.0.0 <v49.0.4Fix Suggestion:
Update to version v49.0.4wasmtime (RUST):
Affected version(s) >=48.0.0 <48.0.7Fix Suggestion:
Update to version 48.0.7wasmtime (RUST):
Affected version(s) >=49.0.0 <49.0.4Fix Suggestion:
Update to version 49.0.4Related Resources (12)
Do you need more information?
Contact UsCVSS v4
Base Score:
5.7
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
PRESENT
Privileges Required
HIGH
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:
4.2
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
HIGH
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
EPSS
Base Score:
0.43