CVE-2026-77936
CVE-2026-77936 · Letta through 0.16.8 Insecure Default Configuration Unauthenticated API and PostgreSQL Access
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 9.3 · Critical · EPSS 0.5%
- Published
- Updated
Affected products and versions
letta
- Versions
- ≥ 0, ≤ 0.16.8: Affected (semver)
No fix published
Original sources
- https://www.lasso.security/vulnerability-database/cve-2026-77936
- https://github.com/letta-ai/letta/blob/1131535716e8a31c9a437f8695e25ac98f203a24/compose.yaml#L17
- https://github.com/letta-ai/letta/blob/1131535716e8a31c9a437f8695e25ac98f203a24/letta/server/rest_api/app.py#L799
- https://www.vulncheck.com/advisories/letta-through-0.16.8-insecure-default-configuration-unauthenticated-api-and-postgresql-access
- https://nvd.nist.gov/vuln/detail/CVE-2026-77936