CVE-2026-115388
Published:October 22, 2026
Updated:October 23, 2026
wasmtime-wasi-http in Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 does not enforce the wasi:io/streams check-write allowance for WASIp2 outgoing HTTP bodies, so oversized writes succeed instead of trapping. A malicious guest can pass large buffers to write on outgoing-body resources, holding host allocations for the store's lifetime and exhausting host memory.
Affected Packages
https://github.com/bytecodealliance/wasmtime.git (GITHUB):
Affected version(s) >=v36.0.0 <v36.0.16Fix Suggestion:
Update to version v36.0.16https://github.com/bytecodealliance/wasmtime.git (GITHUB):
Affected version(s) >=v48.0.0 <v48.0.3Fix Suggestion:
Update to version v48.0.3https://github.com/bytecodealliance/wasmtime.git (GITHUB):
Affected version(s) =v49.0.0 <v49.0.1Fix Suggestion:
Update to version v49.0.1wasmtime-wasi-http (RUST):
Affected version(s) >=36.0.0 <36.0.16Fix Suggestion:
Update to version 36.0.16wasmtime-wasi-http (RUST):
Affected version(s) >=48.0.0 <48.0.3Fix Suggestion:
Update to version 48.0.3wasmtime-wasi-http (RUST):
Affected version(s) =49.0.0 <49.0.1Fix Suggestion:
Update to version 49.0.1Related Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.9
Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
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:
6.2
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Uncontrolled Resource Consumption