{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-77936", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-08-21T17:52:36.080Z", "datePublished": "2026-10-20T00:46:14.144Z", "dateUpdated": "2026-10-20T00:46:14.144Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-10-20T00:46:14.144Z"}, "datePublic": "2026-10-18T00:00:00.000Z", "title": "Letta through 0.16.8 Insecure Default Configuration Unauthenticated API and PostgreSQL Access", "descriptions": [{"lang": "en", "value": "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."}], "tags": ["unsupported-when-assigned"], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Initialization of a Resource with an Insecure Default", "cweId": "CWE-1188", "type": "CWE"}]}], "affected": [{"vendor": "letta-ai", "product": "letta", "defaultStatus": "unaffected", "versions": [{"version": "0", "lessThanOrEqual": "0.16.8", "status": "affected", "versionType": "semver"}], "packageURL": "pkg:pypi/letta", "collectionURL": "https://pypi.org", "repo": "https://github.com/letta-ai/letta"}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:letta:letta:*:*:*:*:*:*:*:*", "versionEndIncluding": "0.16.8"}]}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 9.3, "baseSeverity": "CRITICAL"}}, {"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL"}}], "references": [{"url": "https://www.lasso.security/vulnerability-database/cve-2026-77936", "tags": ["technical-description", "exploit"], "name": "Lasso.security Advisory"}, {"url": "https://github.com/letta-ai/letta/blob/1131535716e8a31c9a437f8695e25ac98f203a24/compose.yaml#L17", "tags": ["technical-description"]}, {"url": "https://github.com/letta-ai/letta/blob/1131535716e8a31c9a437f8695e25ac98f203a24/letta/server/rest_api/app.py#L799", "tags": ["technical-description"]}, {"name": "VulnCheck Advisory: Letta through 0.16.8 Insecure Default Configuration Unauthenticated API and PostgreSQL Access", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/letta-through-0.16.8-insecure-default-configuration-unauthenticated-api-and-postgresql-access"}], "credits": [{"lang": "en", "value": "Noy Pearl", "type": "finder"}, {"lang": "en", "value": "Michael Sromin", "type": "finder"}, {"lang": "en", "value": "Ophir Dror", "type": "finder"}], "x_generator": {"engine": "vulncheck-endgame"}}}}

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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,0.16.8]"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "letta", "source": "cna", "vendor": "letta-ai"}, "product": "letta", "vendor": "letta"}], "created": "2026-10-20T03:00:16.291087+00:00", "updated": "2026-10-20T03:00:16.291107+00:00", "vendors": ["letta", "letta$PRODUCT$letta"]}