CVE-2026-115385 Wasmtime 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2 Host Panic via WASIp3 Timestamps
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-115385?
CVE-2026-115385 is a medium-severity vulnerability in bytecodealliance wasmtime, published on 22 Oct 2026.
Official description
Wasmtime 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains a denial of service vulnerability in the wasmtime-wasi WASIp3 implementation that allows guests to abort the Unix host process. Guests with mutable preopened directory access can call set-times or set-times-at with negative seconds timestamps before the epoch, triggering an assertion failure that crashes the host.
Weakness: CWE-754
Which versions are affected by CVE-2026-115385?
1 open source package ship an affected version, including wasmtime-wasi.
| Package | Affected | Fixed in |
|---|---|---|
wasmtime-wasi crates.io | From 46.0.0 | 48.0.4, 49.0.2 |
How do I fix CVE-2026-115385?
Upgrade wasmtime-wasi to a fixed version for your release line: 48.0.4 or 49.0.2.
Is CVE-2026-115385 being exploited?
There is no known exploitation of CVE-2026-115385 in the wild and no public exploit code.
Sources
Also known as GHSA-c8j4-4v4r-vm84, GHSA-mr2v-56j5-cmfc, RUSTSEC-2026-0324, UBUNTU-CVE-2026-115385.