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CVE-2026-77936

Letta through 0.16.8 Insecure Default Configuration Unauthenticated API and PostgreSQL Access

  • Critical 9.8
  • A public exploit reference is listed

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.

Key facts

Published
20 Oct 2026
Last changed
20 Oct 2026
Assigned by
VulnCheck
EPSS
0.589% likely to be exploited in the next 30 days, higher than 48.706% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: poc; Automatable: yes; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 9.3CVSS 4.0, Criticalfrom the CNA (VulnCheck)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
  • 9.8CVSS 3.1, Criticalfrom the CNA (VulnCheck)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

No explicit remediation statement is available on this page yet. Consult the original record and vendor references before choosing a fix.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
letta-ailetta
  • Default status: unaffected
  • 0 up to and including 0.16.8 (affected)

Timeline

  1. 20 Oct 2026 Published

Weakness

References