---
id: CVE-2026-77936
title: >-
  Letta through 0.16.8 Insecure Default Configuration Unauthenticated API and
  PostgreSQL Access
summary: >-
  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. Re…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-1188
vendor: letta-ai
product: letta
affected:
  - letta <= 0.16.8
published: '2026-10-20'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T00:46:14.144Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-77936'
references:
  - url: 'https://www.lasso.security/vulnerability-database/cve-2026-77936'
    label: Lasso.security Advisory
  - url: >-
      https://github.com/letta-ai/letta/blob/1131535716e8a31c9a437f8695e25ac98f203a24/compose.yaml#L17
  - url: >-
      https://github.com/letta-ai/letta/blob/1131535716e8a31c9a437f8695e25ac98f203a24/letta/server/rest_api/app.py#L799
  - url: >-
      https://www.vulncheck.com/advisories/letta-through-0.16.8-insecure-default-configuration-unauthenticated-api-and-postgresql-access
    label: >-
      VulnCheck Advisory: Letta through 0.16.8 Insecure Default Configuration
      Unauthenticated API and PostgreSQL Access
tags:
  - cve.org
ingestedAt: '2026-10-20T01:49:42.623Z'
---

## Overview

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.

## Affected

- `letta <= 0.16.8`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.