Rust advisories / wasmtime-wasi
Vulnerability MediumRUSTSEC-2026-0324 · wasmtime-wasi
RUSTSEC-2026-0324: Guest can panic host through filesystem timestamp before the epoch on wasip3
Short answerA security vulnerability in the wasmtime-wasi crate: Guest can panic host through filesystem timestamp before the epoch on wasip3. Medium severity (CVSS 6.2). Fixed in 48.0.4, 49.0.2: update to a fixed version.
| Crate | wasmtime-wasi |
|---|---|
| Type | Vulnerability |
| Affected versions | From 46.0.0 before 48.0.4; from 49.0.0 before 49.0.2. |
| Fixed in | 48.0.4, 49.0.2 |
| Severity | Medium, CVSS 6.2 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| Published | 2026-10-02 |
| Last changed | 2026-10-23 |
| Also known as | CVE-2026-115385, GHSA-mr2v-56j5-cmfc |
What to do
- See which version you have:
cargo tree -i wasmtime-wasi(it also shows which of your dependencies pulls it in). - Update within your version requirement:
cargo update -p wasmtime-wasi. If the fix is a newer major or minor than your requirement allows, raise it in Cargo.toml (for examplewasmtime-wasi = "49.0.2") or update the dependency that pulls it in. - Check again with
cargo audit, or paste your Cargo.lock into our Cargo.toml checker.
Details from the advisory
This is an entry in the RustSec database for the Wasmtime security advisory located at https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-mr2v-56j5-cmfc For more information see the GitHub-hosted security advisory.
References
- Package: crates.io/crates/wasmtime-wasi
- Advisory: rustsec.org/advisories/RUSTSEC-2026-0324.html
- Web: github.com/bytecodealliance/wasmtime/pull/14486
From the RustSec Advisory Database (CC0-1.0) via the OSV export, downloaded Oct 24, 2026. Severity score computed from the published CVSS vector.
Other advisories for wasmtime-wasi
- Vulnerability HighRUSTSEC-2026-0149 · 2026-05-21WASI path_open(TRUNCATE) bypasses `FilePerms::WRITE` host restriction
- VulnerabilityRUSTSEC-2026-0182 · 2026-06-15Leak in WASIp1 `fd_renumber` implementation
- Vulnerability MediumRUSTSEC-2026-0188 · 2026-06-24WASI hard links and renames bypass wasmtime-wasi's FilePerms for destination
- Vulnerability MediumRUSTSEC-2026-0314 · 2026-09-24Guest can panic host through filesystem datetime overflow
- Vulnerability MediumRUSTSEC-2026-0321 · 2026-10-02WASI preview 0 implementation of `poll_oneoff` circumvents fuel consumption
- VulnerabilityRUSTSEC-2026-0322 · 2026-10-02Excessive allocated memory on the host when guests don't have stdio
- VulnerabilityRUSTSEC-2026-0323 · 2026-10-02fd_readdir copies uninitialized struct padding into guest memory
- VulnerabilityRUSTSEC-2026-0352 · 2026-10-14Filesystem sandbox escape when renaming symlinks with trailing slashes
Up next
Same cratewasmtime-wasi: security historyEvery advisory for this crate, and whether it is safe to use today.Read it next →Did this answer your question?