Rust advisories / pqcrypto-falcon
UnmaintainedRUSTSEC-2026-0165 · pqcrypto-falcon
RUSTSEC-2026-0165: `pqcrypto-falcon` is unmaintained: upstream PQClean project being archived
Short answerNot a bug report: pqcrypto-falcon is no longer maintained, so future security issues will not be fixed. Plan to move to a maintained alternative.
| Crate | pqcrypto-falcon |
|---|---|
| Type | Unmaintained |
| Affected versions | Every version. |
| Fixed in | not applicable (the crate is unmaintained) |
| Severity | not scored |
| Published | 2026-06-04 |
| Last changed | 2026-06-04 |
| Also known as | none |
What to do
- Look for a maintained fork or alternative crate.
- If you cannot move yet, acknowledge it in your audit config so CI stays green while you plan: add
"RUSTSEC-2026-0165"toignorein.cargo/audit.tomlordeny.toml, with a comment saying why. - Find who pulls it in:
cargo tree -i pqcrypto-falcon.
Details from the advisory
This crate provides Rust bindings to the Falcon (FN-DSA) signature scheme via C implementations from PQClean. The PQClean project is being archived in or after July 2026 (see PQClean/PQClean#604), after which no further security patches or bug fixes will be applied to the upstream implementations.
As a result, this crate will no longer receive updates. Users should migrate to the fn-dsa crate, which provides a pure-Rust implementation of FN-DSA (FIPS 206).
References
- Package: crates.io/crates/pqcrypto-falcon
- Advisory: rustsec.org/advisories/RUSTSEC-2026-0165.html
- Report: github.com/rustpq/pqcrypto/issues/97
From the RustSec Advisory Database (CC0-1.0) via the OSV export, downloaded Oct 24, 2026. Severity score computed from the published CVSS vector.
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