[ CVE-2026-115384 · Published 22 Oct 2026 ]
Vulnerability in bytecodealliance wasmtime
CVSS 9.9
No fix listed yet
[ Why it matters ]Priority signals
- Critical severity: CVSS 9.9
[ Description ]Official description
Wasmtime 39.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains a stack buffer overflow vulnerability that allows malicious guests to write ~16KB to the native stack via unvalidated async callback result types. Attackers can supply components with mistyped component-model-async callback functions to overwrite return addresses, crashing the host or escaping the sandbox.
[ Fixes ]Fixes and patches
No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.