CVE-2026-77936 PUBLISHED

Letta through 0.16.8 Insecure Default Configuration Unauthenticated API and PostgreSQL Access

Assigner: VulnCheck
Reserved: 21.08.2026 Published: 20.10.2026 Updated: 20.10.2026

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 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS Score: 9.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS Score: 9.8

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	letta-ai
Product	letta
Versions	Default: unaffected affected from 0 to 0.16.8 (incl.)

CVE-2026-77936 PUBLISHED

Letta through 0.16.8 Insecure Default Configuration Unauthenticated API and PostgreSQL Access

Metrics

Product Status

Credits

References

Problem Types