CVE-2026-77936
Critical
Description
Letta through 0.16.8 ships a compose.yaml that does not enable LETTA_SERVER_SECURE, so the password middleware is never added and all API routes are unauthenticated, and it exposes a superuser PostgreSQL port with default credentials. Remote attackers can execute arbitrary Python via POST /v1/tools/run, manage /v1/admin users, or run OS commands via COPY PROGRAM.
SeverityCritical
CVSS9.8
Exploit probability—
ProductLetta
PublishedOct 20, 2026
First seenOct 20, 2026
Weakness typeCWE-1188CWE-1188
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| letta-ai letta | v ≤ 0.16.8 | — |
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