CVE-2026-77938— Letta through 0.16.8 Credential Exposure via Tool Sandbox Environment Inheritance
Quick assessment
Affected
letta-ai letta
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Letta 0.16.8 版本存在信息泄露漏洞。由于 LocalSandbox 子进程会继承完整的服务器环境变量，攻击者可通过 接口或自定义工具执行代码，读取 、 以及云服务商 API 密钥等敏感信息，进而访问跨租户的数据库数据。
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I. Basic Information for CVE-2026-77938
Vulnerability Information
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Vulnerability Title
Letta through 0.16.8 Credential Exposure via Tool Sandbox Environment Inheritance
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过环境变量导致的信息暴露
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-77938
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Patches & Fixes for CVE-2026-77938 (1)
Vendor Advisories for CVE-2026-77938 (1)
Other References for CVE-2026-77938 (1)
Same Patch Batch · letta-ai · 2026-10-20 · 3 CVEs total
| CVE-2026-77936 | 9.8 CRITICAL | Letta through 0.16.8 Insecure Default Configuration Unauthenticated API and PostgreSQL Acc |
| CVE-2026-77937 | 8.1 HIGH | Letta through 0.16.8 Cross-Tenant Impersonation via user_id Header |
IV. Related Vulnerabilities
Same product: letta
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CVE-2026-77937
Letta through 0.16.8 Cross-Tenant Impersonation via user_id -
CVE-2026-77936
Letta through 0.16.8 Insecure Default Configuration Unauthen -
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letta-ai letta Incomplete Fix CVE-2025-6101 ast_parsers.py r -
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CVE-2026-77937
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CVE-2026-77936
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CVE-2026-4964
letta-ai letta File URL message_helper.py _convert_message_c
Same weakness: CWE-526
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V. Comments for CVE-2026-77938
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