RUSTSEC-2024-0011: Unauthenticated Nonce Increment in snow

What to do

1. See which version you have: cargo tree -i snow (it also shows which of your dependencies pulls it in).
2. Update within your version requirement: cargo update -p snow. If the fix is a newer major or minor than your requirement allows, raise it in Cargo.toml (for example snow = "0.9.5") or update the dependency that pulls it in.
3. Check again with cargo audit, or paste your Cargo.lock into our Cargo.toml checker.

Details from the advisory

There was a logic bug where unauthenticated payloads could still cause a nonce increment in snow's internal state. For an attacker with privileges to inject packets into the channel over which the Noise session operates, this could allow a denial-of-service attack which could prevent message delivery by sending garbage data.

Note that this only affects those who are using the stateful TransportState, not those using StatelessTransportState.

This has been patched in version 0.9.5, and all users are recommended to update.

References

• Package: crates.io/crates/snow
• Advisory: rustsec.org/advisories/RUSTSEC-2024-0011.html
• Web: github.com/mcginty/snow/commit/12e8ae55547ae297d5f70599e5c884ea891303eb

From the RustSec Advisory Database (CC0-1.0) via the OSV export, downloaded Oct 24, 2026. Severity score computed from the published CVSS vector.