CVE-2026-115383
Published:October 22, 2026
Updated:October 23, 2026
Wasmtime 47.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains an improper validation vulnerability that accepts components whose core modules import WebAssembly tags with a subtype of the original type. Malicious guests can mis-type exception object payloads to corrupt the GC heap, causing Wasmtime to panic when the exceptions proposal is enabled.
Affected Packages
https://github.com/bytecodealliance/wasm-tools.git (GITHUB):
Affected version(s) =v1.260.0 <v1.261.0Fix Suggestion:
Update to version v1.261.0https://github.com/bytecodealliance/wasm-tools.git (GITHUB):
Affected version(s) =v1.254.0 <v1.254.2Fix Suggestion:
Update to version v1.254.2https://github.com/bytecodealliance/wasm-tools.git (GITHUB):
Affected version(s) =v1.258.0 <v1.258.1Fix Suggestion:
Update to version v1.258.1wasmtime (RUST):
Affected version(s) >=48.0.0 <48.0.4Fix Suggestion:
Update to version 48.0.4wasmparser (RUST):
Affected version(s) =0.260.0 <0.261.0Fix Suggestion:
Update to version 0.261.0wasmtime (RUST):
Affected version(s) >=49.0.0 <49.0.2Fix Suggestion:
Update to version 49.0.2wasmparser (RUST):
Affected version(s) =0.254.0 <0.254.2Fix Suggestion:
Update to version 0.254.2wasmparser (RUST):
Affected version(s) =0.258.0 <0.258.3Fix Suggestion:
Update to version 0.258.3Related Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
5.9
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
NONE
CVSS v3
Base Score:
4.8
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Improper Validation of Specified Type of Input