CVE-2026-115389
Published:October 22, 2026
Updated:October 23, 2026
Wasmtime before 36.0.16, 37.0.0 before 48.0.3, and 49.0.0 before 49.0.1 does not adequately account for host allocations when lifting guest values through the dynamically-typed Val API, bypassing the hostcall fuel limit. A malicious WebAssembly guest can return crafted values that allocate at least ~100x more host memory than tracked, causing denial of service.
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 (RUST):
Affected version(s) =49.0.0 <49.0.1Fix Suggestion:
Update to version 49.0.1wasmtime (RUST):
Affected version(s) >=36.0.0 <36.0.16Fix Suggestion:
Update to version 36.0.16wasmtime (RUST):
Affected version(s) >=48.0.0 <48.0.3Fix Suggestion:
Update to version 48.0.3Related Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
1
Attack Vector
ADJACENT
Attack Complexity
HIGH
Attack Requirements
PRESENT
Privileges Required
LOW
User Interaction
PASSIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
2.3
Attack Vector
ADJACENT
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Weakness Type (CWE)
Allocation of Resources Without Limits or Throttling