#VU125756 Type Confusion in Wasmtime - CVE-2026-34945

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Main Vulnerability Database Vulnerabilities #VU125756

#VU125756 Type Confusion in Wasmtime - CVE-2026-34945

Published: April 10, 2026


Vulnerability identifier: #VU125756
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-34945
CWE-ID: CWE-843
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
Wasmtime
Software vendor:
Bytecode Alliance

Description

The vulnerability allows a remote user to disclose sensitive information.

The vulnerability exists due to incorrect type handling in the Winch compiler's translation of the table.size instruction when processing WebAssembly code that uses 64-bit tables. A remote user can execute crafted WebAssembly code to disclose sensitive information.

Exploitation requires use of the memory64 proposal and can expose data from the host stack to a WebAssembly guest.


Remediation

Install security update from vendor's website.

External links