CVE-2026-77938CWE-526

CVE-2026-77938

Medium · published October 20, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
26.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
7.1 · 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
EPSS
0.00341 · 26.3th percentile
Weakness
CWE-526 · Cleartext Storage of Sensitive Information in an Environment Variable
Published
2026-10-20T05:17Z
References (3)
https://github.com/letta-ai/letta/blob/1131535716e8a31c9a437f8695e25ac98f203a24/letta/services/tool_sandbox/base.py#L487 · [email protected]https://www.lasso.security/vulnerability-database/cve-2026-77938 · [email protected]https://www.vulncheck.com/advisories/letta-through-0.16.8-credential-exposure-via-tool-sandbox-environment-inheritance · [email protected]
EPSS history
Timeline
  • 21 OCT 03:32Z
    EPSS moved — → 0%
    epss
  • 20 OCT 00:46Z
    Letta through 0.16.8 Credential Exposure via Tool Sandbox Environment Inheritance
    cvelistv5
  • 20 OCT 00:46Z
    Letta through 0.16.8 Credential Exposure via Tool Sandbox Environment Inheritance
    cvelistv5