CVE-2026-115391
Published:October 22, 2026
Updated:October 23, 2026
Wasmtime 46.0.0 before 46.0.3 and 47.0.0 before 47.0.4 contains an uncontrolled resource allocation vulnerability in its WASIp3 implementation that buffers guest-specified-length writes on the host without limit. Malicious guests can offer large buffers to WASIp3 file or HTTP write streams, causing the host to copy and buffer all bytes, bounded only by guest linear memory, exhausting host memory.
Affected Packages
https://github.com/bytecodealliance/wasmtime.git (GITHUB):
Affected version(s) >=v47.0.0 <v47.0.4Fix Suggestion:
Update to version v47.0.4https://github.com/bytecodealliance/wasmtime.git (GITHUB):
Affected version(s) >=v46.0.0 <v46.0.3Fix Suggestion:
Update to version v46.0.3wasmtime (RUST):
Affected version(s) >=46.0.0 <46.0.3Fix Suggestion:
Update to version 46.0.3wasmtime-wasi-http (RUST):
Affected version(s) >=47.0.0 <47.0.4Fix Suggestion:
Update to version 47.0.4wasmtime-wasi-http (RUST):
Affected version(s) >=46.0.0 <46.0.3Fix Suggestion:
Update to version 46.0.3wasmtime-wasi (RUST):
Affected version(s) >=47.0.0 <47.0.4Fix Suggestion:
Update to version 47.0.4wasmtime-wasi (RUST):
Affected version(s) >=46.0.0 <46.0.3Fix Suggestion:
Update to version 46.0.3wasmtime (RUST):
Affected version(s) >=47.0.0 <47.0.4Fix Suggestion:
Update to version 47.0.4Related Resources (2)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.9
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
HIGH
CVSS v3
Base Score:
5.8
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Allocation of Resources Without Limits or Throttling