{"schema":"threatline.record/2","record":{"id":"CVE-2026-77936","aliases":[],"summary":"Letta through 0.16.8 Insecure Default Configuration Unauthenticated API and PostgreSQL Access","details":"Letta through 0.16.8 ships a compose.yaml that does not enable LETTA_SERVER_SECURE, so the password middleware is never added and all API routes are unauthenticated, and it exposes a superuser PostgreSQL port with default credentials. Remote attackers can execute arbitrary Python via POST /v1/tools/run, manage /v1/admin users, or run OS commands via COPY PROGRAM.","categories":["Unclassified"],"product":"letta","vendor":"letta-ai","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-77936","source_modified_at":"2026-10-20T16:07:28.161Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"letta","vendor":"letta-ai","versions":[{"version":"0","lessThanOrEqual":"0.16.8","status":"affected","versionType":"semver"}],"defaultStatus":"unaffected"}],"fixed_versions":[],"cvss":9.3,"severity":"Critical","kev":{"listed":false},"epss":{"probability":0.0047,"percentile":0.39717,"score_date":"2026-10-23"},"published_at":"2026-10-20T00:46:14.144Z","modified_at":"2026-10-20T16:07:28.161Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-77936","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-20T16:07:28.161Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-77936","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://www.lasso.security/vulnerability-database/cve-2026-77936","tags":["technical-description","exploit"]},{"source":"CVE List","url":"https://github.com/letta-ai/letta/blob/1131535716e8a31c9a437f8695e25ac98f203a24/compose.yaml#L17","tags":["technical-description"]},{"source":"CVE List","url":"https://github.com/letta-ai/letta/blob/1131535716e8a31c9a437f8695e25ac98f203a24/letta/server/rest_api/app.py#L799","tags":["technical-description"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/letta-through-0.16.8-insecure-default-configuration-unauthenticated-api-and-postgresql-access","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"poc","automatable":"yes","technical_impact":"total","assessed_at":"2026-10-20T16:04:32.766807Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-20T16:07:28.161Z","content_hash":"a5c0c0658a488910265743be4aa41afe86287b08e2baf73bb45d8378bdb44b38"}}