Letta through 0.16.8 contains an information disclosure vulnerability that allows users running tools to read server secrets because LocalSandbox subprocesses inherit the full server environment. Attackers can run code via POST /v1/tools/run or custom tools to read LETTA_PG_URI, POSTGRES_PASSWORD, and provider API keys, then access cross-tenant database data.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00341.

Exploitation poc

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
letta-ai letta unaffected
Version Status Constraints
0 affected ≤ 0.16.8

No data.

No data.

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Project Subscriptions

Vendors Products
Letta Subscribe
Letta Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/letta-ai/letta/blob/1131535716e8a31c9a437f8695e25ac98f203a24/letta/services/tool_sandbox/base.py#L487 cve-icon cve-icon
https://www.lasso.security/vulnerability-database/cve-2026-77938 cve-icon cve-icon
https://www.vulncheck.com/advisories/letta-through-0.16.8-credential-exposure-via-tool-sandbox-environment-inheritance cve-icon cve-icon
History

Tue, 20 Oct 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 20 Oct 2026 01:15:00 +0000

Type Values Removed Values Added
Description Letta through 0.16.8 contains an information disclosure vulnerability that allows users running tools to read server secrets because LocalSandbox subprocesses inherit the full server environment. Attackers can run code via POST /v1/tools/run or custom tools to read LETTA_PG_URI, POSTGRES_PASSWORD, and provider API keys, then access cross-tenant database data.
Title Letta through 0.16.8 Credential Exposure via Tool Sandbox Environment Inheritance
First Time appeared Letta
Letta letta
Weaknesses CWE-526
CPEs cpe:2.3:a:letta:letta:*:*:*:*:*:*:*:*
Vendors & Products Letta
Letta letta
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'}

cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-20T13:47:53.481Z

Reserved: 2026-08-21T17:52:36.080Z

Link: CVE-2026-77938

cve-icon Vulnrichment

Updated: 2026-10-20T13:47:49.059Z

cve-icon NVD

Status : Received

Published: 2026-10-20T01:17:20.410

Modified: 2026-10-20T14:17:01.323

Link: CVE-2026-77938

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-20T12:15:14Z

Weaknesses