The pip-audit step added in E1 S4 flagged cryptography 46.0.7 for PYSEC-2026-3552
/3553/3554 and GHSA-537c-gmf6-5ccf; all are fixed by 50.0.0. The requirements.txt
ceiling `<47` was blocking the upgrade — relaxed to `>=50.0.0,<51`. The lock is a
surgical bump (only the cryptography line changed; cffi 2.1.1 already satisfies
it, no other package moved). pip-audit -r requirements.lock is now clean.
Add tests/test_security.py (there was none for the crypto primitives): the
Fernet encrypt/decrypt round-trip, decrypt_optional degrading on garbage and on a
key mismatch (the B-core-2 path), and the argon2 password hash/verify round-trip
— so a future crypto-lib bump can't silently break the token-at-rest path. Gate
green: 330 pytest.
requirements.txt stays the source (floor ranges); requirements.lock pins the
exact resolved versions (generated in the python:3.12-slim prod base, extras like
psycopg-binary/uvloop included). The prod Dockerfile, Dockerfile.test and CI now
install the lock, so the image is reproducible and the versions are the ones
pip-audit scans. CI gains a non-blocking pip-audit step over the lock. The
frontend build + CI move from the EOL node 20 to node 22.
peter