CVE-2026-115393
Published:October 22, 2026
Updated:October 23, 2026
Wasmtime before 24.0.12, 25.0.0 before 36.0.13, 37.0.0 before 46.0.2, and 47.0.0 before 47.0.3 contains a type confusion vulnerability because several Store APIs fail to validate that objects belong to the Store's Engine. Embedders mixing objects between Engines via Instance::new, StructRefPre::new, or Tag::new can trigger trampoline signature mismatches causing out-of-bounds stack writes, GC heap corruption, or panics.
Affected Packages
https://github.com/bytecodealliance/wasmtime.git (GITHUB):
Affected version(s) >=v36.0.0 <v36.0.13Fix Suggestion:
Update to version v36.0.13https://github.com/bytecodealliance/wasmtime.git (GITHUB):
Affected version(s) >=v47.0.0 <v47.0.3Fix Suggestion:
Update to version v47.0.3https://github.com/bytecodealliance/wasmtime.git (GITHUB):
Affected version(s) >=v24.0.0 <v24.0.12Fix Suggestion:
Update to version v24.0.12https://github.com/bytecodealliance/wasmtime.git (GITHUB):
Affected version(s) >=v46.0.0 <v46.0.2Fix Suggestion:
Update to version v46.0.2wasmtime (RUST):
Affected version(s) >=36.0.0 <36.0.13Fix Suggestion:
Update to version 36.0.13wasmtime (RUST):
Affected version(s) >=47.0.0 <47.0.3Fix Suggestion:
Update to version 47.0.3wasmtime (RUST):
Affected version(s) >=46.0.0 <46.0.2Fix Suggestion:
Update to version 46.0.2wasmtime (RUST):
Affected version(s) >=24.0.0 <24.0.12Fix Suggestion:
Update to version 24.0.12Related Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
1
Attack Vector
LOCAL
Attack Complexity
HIGH
Attack Requirements
PRESENT
Privileges Required
HIGH
User Interaction
PASSIVE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
3.8
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
HIGH
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
LOW
Weakness Type (CWE)
Out-of-bounds Write