Rust advisories / pqcrypto
UnmaintainedRUSTSEC-2026-0164 · pqcrypto
RUSTSEC-2026-0164: `pqcrypto` is unmaintained: upstream PQClean project being archived
Short answerNot a bug report: pqcrypto is no longer maintained, so future security issues will not be fixed. Plan to move to a maintained alternative.
| Crate | pqcrypto |
|---|---|
| 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-2026-0164"toignorein.cargo/audit.tomlordeny.toml, with a comment saying why. - Find who pulls it in:
cargo tree -i pqcrypto.
Details from the advisory
The pqcrypto crate and the entire pqcrypto-* ecosystem wrap 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, algorithm updates, or bug fixes will be applied to the upstream implementations.
As a result, this crate and all dependent crates in the pqcrypto-* ecosystem will no longer receive updates. Users should migrate to actively maintained alternatives. Pure-Rust replacements are available for several algorithms:
- ML-KEM (FIPS 203):
ml-kem - ML-DSA (FIPS 204):
ml-dsa - SLH-DSA (FIPS 205):
slh-dsa - FN-DSA (FIPS 206):
fn-dsa
References
- Package: crates.io/crates/pqcrypto
- Advisory: rustsec.org/advisories/RUSTSEC-2026-0164.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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