CVE-2026-59163
CriticalCVSS 9.1Summary
Mnemosyne before v3.10.1 has a vulnerability in the auth check in mnemosyne/core/sync_server.py where JWT parsing uses base64 and disables signature verification. The server accepts any well-formed token, including those with alg: none or wrong key.
Risk Assessment
An attacker can gain unauthorized access to the sync server, potentially leading to confidentiality compromise or modification of AI agent data.
Recommendation
Upgrade Mnemosyne to version v3.10.1 or later. If not possible, restrict access to the sync server endpoint to trusted clients only.
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Original NVD description (English source)
Mnemosyne is a memory layer for artificial intelligence agents. Prior to v3.10.1, the auth check in mnemosyne/core/sync_server.py parsed the JWT's header and payload using base64 decoding, then passed the token to a jwt library call with options that effectively disabled signature verification. The server accepted any well-formed token regardless of the signature, including tokens with alg: none and tokens signed with the wrong key. The fix in v3.10.1 replaces the broken decode with a from-scratch HS256 verifier using only the Python standard library. For users who cannot upgrade immediately, restrict network access to the sync server endpoint to trusted clients only. Firewall, reverse proxy with mTLS, or localhost bind with SSH tunnel are all viable. The vulnerability is not exploitable against an unreachable endpoint.