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TI-2025-05511 Aliases CVE-2025-6101GHSA-f28h-v254-c2wx

letta-ai letta interface.py function_message eval injection

Priority MEDIUM 56CWE-94Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
Low · Low · Low
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-94.

Summary

A vulnerability classified as critical has been found in letta-ai letta up to 0.4.1. Affected is the function function_message of the file letta/letta/interface.py. The manipulation of the argument function_name/function_args leads to improper neutralization of directives in dynamically evaluated code. The exploit has been disclosed to the public and may be used.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00301 23rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
letta-ailetta0.4.0; 0.4.1—No fix listedCNA
  • letta Vendorletta-ai Affected 0.4.0; 0.4.1 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-6101
  2. 2026-10-03 Alias added: GHSA-f28h-v254-c2wx

References

Exploit 1

  • TI-2026-76666 Insecure default configuration in Letta exposes API and PostgreSQL CVSS 4.0CRITICAL 9.3
  • TI-2026-76667 Letta lets API callers impersonate other users via user_id header CVSS 4.0HIGH 8.6
  • TI-2026-15517 letta-ai LettaBot API Status Route server.ts missing authentication CVSS 4.0MEDIUM 6.9
  • TI-2026-76668 Letta tool sandbox exposes server secrets to tool users CVSS 4.0HIGH 7.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences