OSV-2026-292 UNKNOWN WRITE in <wasmtime::runtime::func::Func>::call_unchecked_raw::<
A memory corruption vulnerability in the Wasmtime runtime library allows attackers to potentially execute arbitrary code or cause denial of service via crafted WebAssembly modules.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Not stated
- Victim action needed
- Not needed
- Fix
- None listed
What is OSV-2026-292?
OSV-2026-292 is a memory corruption vulnerability in wasmtime, published on 23 Feb 2026.
Official description
OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=486503337
Crash type: UNKNOWN WRITE
Crash state:
<wasmtime::runtime::func::Func>::call_unchecked_raw::<
wasmtime::runtime::component::func::call_post_return::<wasmtime::runtime::store:
<<wasmtime::runtime::component::instance::Instance>::queue_call<
Which versions are affected by OSV-2026-292?
1 open source package ship an affected version, including wasmtime.
| Package | Affected | Fixed in |
|---|---|---|
wasmtime OSS-Fuzz | All versions | None |
How do I fix OSV-2026-292?
No fix has been published for OSV-2026-292 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is OSV-2026-292 being exploited?
There is no known exploitation of OSV-2026-292 in the wild and no public exploit code.