CVE-2026-55165

In Lemur 1.9.0 and earlier, lemur/auth/service.py:130-137 reads the alg field from an unverified JWT header and passes it to pyjwt.decode(..., algorithms=[header_data["alg"]]), letting an attacker choose the verification algorithm. PyJWT 2.x blocks alg=none, so direct ATO requires a separate LEMU...