CVE-2026-115893
Published:October 23, 2026
Updated:October 29, 2026
Wasmtime is a runtime for WebAssembly. Prior to 36.0.19, 48.0.7, and 49.0.4, the Cranelift compiler backend on aarch64 can compile a Wasm br_table instruction with more than approximately 256,000 targets so that it has an incorrect conditional branch target. The branch can then jump to arbitrary other code at a user-controlled offset, allowing a user-controlled Wasm module to escape the sandbox on aarch64 engines using the default Cranelift backend. This issue is fixed in versions 36.0.19, 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) >=v36.0.0 <v36.0.19Fix Suggestion:
Update to version v36.0.19https://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 48.0.7cranelift-codegen (RUST):
Affected version(s) >=0.123.0 <0.123.19Fix Suggestion:
Update to version 0.123.19cranelift-codegen (RUST):
Affected version(s) >=0.136.0 <0.136.4Fix Suggestion:
Update to version 0.136.4wasmtime (RUST):
Affected version(s) >=37.0.0 <48.0.7Fix Suggestion:
Update to version 48.0.7wasmtime (RUST):
Affected version(s) >=0.0.0 <36.0.19Fix Suggestion:
Update to version 36.0.19cranelift-codegen (RUST):
Affected version(s) >=0.135.0 <0.135.7Fix Suggestion:
Update to version 0.135.7wasmtime (RUST):
Affected version(s) >=36.0.0 <36.0.19Fix Suggestion:
Update to version 36.0.19wasmtime (RUST):
Affected version(s) >=49.0.0 <49.0.4Fix Suggestion:
Update to version 49.0.4Related Resources (16)
Do you need more information?
Contact UsCVSS v4
Base Score:
9.4
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
HIGH
Subsequent System Availability
HIGH
CVSS v3
Base Score:
9.9
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Insufficient Control Flow Management
EPSS
Base Score:
0.99