CVE-2026-77936Critical· 9.8▾ AbyssalPoC available

Letta through 0.16.8 Insecure Default Configuration Unauthenticated API and PostgreSQL Access

▾ Abyssal zone — Critical with a public exploit or in-the-wild use

Depth score66/ 100 · Elevated

impact 53.9 · likelihood 0.1 · exploitation 12

⚡ Agent-ready:Raw markdown ↗JSON ↗

Proof of concept

A public proof-of-concept already exists for this vulnerability — see Exploit availability below.

…

Published

Oct 20, 2026

Updated

Oct 20, 2026

CVSS

9.8

Vendor

letta-ai

Product

letta

CWE

CWE-1188

Depth score

66 · Elevated

EPSS

0.59% · p48

Platforms

—

Source

CVEORG

Vector

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

CISA SSVC

decided 2026-10-20

Exploitation: poc
Automatable: yes
Technical impact: total

Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.

EPSS history

Exploit-prediction probability, daily snapshots since Oct 20.

0.5% → 0.6%▲ 0.1%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

4 events · 6 days

Oct 20, 2026Published
Disclosed via CVEORG
Oct 20, 2026EPSS first tracked
0.5%
Oct 20, 2026Public exploit observed
Exploit / PoC code exists
Oct 26, 2026EPSS peak
0.5% → 0.6%

letta-ai CWE-1188 #cve.org #exploit-available

Affected

letta <= 0.16.8

Full technical detail▾

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.

References

Change history

Field changes observed since this record was first indexed.

Oct 20, 2026Public exploit / PoC published

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#cve.org#exploit-available

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CVE-2026-77936Critical· 9.8▾ AbyssalPoC available

Letta through 0.16.8 Insecure Default Configuration Unauthenticated API and PostgreSQL Access

▾ Abyssal zone — Critical with a public exploit or in-the-wild use

Depth score66/ 100 · Elevated

impact 53.9 · likelihood 0.1 · exploitation 12

⚡ Agent-ready:Raw markdown ↗JSON ↗

Proof of concept

A public proof-of-concept already exists for this vulnerability — see Exploit availability below.

…

Published

Oct 20, 2026

Updated

Oct 20, 2026

CVSS

9.8

Vendor

letta-ai

Product

letta

CWE

CWE-1188

Depth score

66 · Elevated

EPSS

0.59% · p48

Platforms

—

Source

CVEORG

Vector

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

CISA SSVC

decided 2026-10-20

Exploitation: poc
Automatable: yes
Technical impact: total

EPSS history

Exploit-prediction probability, daily snapshots since Oct 20.

0.5% → 0.6%▲ 0.1%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

4 events · 6 days

Oct 20, 2026Published
Disclosed via CVEORG
Oct 20, 2026EPSS first tracked
0.5%
Oct 20, 2026Public exploit observed
Exploit / PoC code exists
Oct 26, 2026EPSS peak
0.5% → 0.6%

letta-ai CWE-1188 #cve.org #exploit-available

Affected

letta <= 0.16.8

Full technical detail▾

Overview

Affected

letta <= 0.16.8

Remediation

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

References

Change history

Field changes observed since this record was first indexed.

Oct 20, 2026Public exploit / PoC published

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#cve.org#exploit-available