CVE-2026-115382
Published:October 22, 2026
Updated:October 23, 2026
Wasmtime 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains a denial-of-service vulnerability in its wasi:http implementation that allows guests to panic the host. Guests can specify a zero between-bytes-timeout request option, which is forwarded directly to a Tokio API that panics, crashing the host embedding.
Affected Packages
https://github.com/bytecodealliance/wasmtime.git (GITHUB):
Affected version(s) >=v48.0.0 <v48.0.4Fix Suggestion:
Update to version v48.0.4https://github.com/bytecodealliance/wasmtime.git (GITHUB):
Affected version(s) >=v49.0.0 <v49.0.2Fix Suggestion:
Update to version v49.0.2wasmtime-wasi-http (RUST):
Affected version(s) >=48.0.0 <48.0.4Fix Suggestion:
Update to version 48.0.4wasmtime-wasi-http (RUST):
Affected version(s) >=49.0.0 <49.0.2Fix Suggestion:
Update to version 49.0.2Related Resources (5)
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)
Improper Validation of Specified Quantity in Input