Vulnerability in Letta-Ai Letta
CVE-2026-77938
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/letta-ai/letta/blob/1131535716e8a31c9a437f8695e25ac98f203a24/letta/s… (technical-description)
- www.lasso.security/vulnerability-database/cve-2026-77938 (technical-description, exploit)
- www.vulncheck.com/advisories/letta-through-0.16.8-credential-exposure-via-tool-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-77938?
- CVE-2026-77938 is a medium-severity vulnerability in Letta-Ai Letta, classified under CWE-526. CVSS score: 6.5/10. Published 2026-10-20.
- How severe is CVE-2026-77938?
- Medium severity. CVSS v3 base score is 6.5 out of 10.