Out-of-bounds read in Wasmtime - CVE-2026-24116
Published: April 23, 2026
Vulnerability identifier: #VU127042
CSH Severity: Medium
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-24116
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to an out-of-bounds read in Cranelift's compilation of the f64.copysign WebAssembly instruction when processing a memory-loaded operand on x86-64 with AVX. A local user can execute crafted WebAssembly code to cause a denial of service.
The issue requires signals-based-traps to be disabled and guard pages to be enabled, and user interaction is required.
Affected software
Wasmtime
How to mitigate CVE-2026-24116
Install security update from vendor's website.
Wasmtime - addressed in versions 36.0.5, 40.0.3, 41.0.1