{
 "id": "CVE-2024-12704",
 "description": "A vulnerability in the LangChainLLM class of the run-llama/llama_index repository, version v0.12.5, allows for a Denial of Service (DoS) attack. The stream_complete method executes the llm using a thread and retrieves the result via the get_response_gen method of the StreamingGeneratorCallbackHandler class. If the thread terminates abnormally before the _llm.predict is executed, there is no exception handling for this case, leading to an infinite loop in the get_response_gen function. This can be triggered by providing an input of an incorrect type, causing the thread to terminate and the process to continue running indefinitely.",
 "published": "2025-03-20",
 "last_modified": "2026-06-17",
 "vuln_status": "Modified",
 "cna": "security@huntr.dev",
 "cvss": {
  "version": "3.0",
  "score": 7.5,
  "severity": "HIGH",
  "vector": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "source": "security@huntr.dev"
 },
 "cwe": [
  "CWE-835"
 ],
 "products": [
  {
   "vendor": "llamaindex",
   "product": "llamaindex",
   "versions_affected": "0.12.5",
   "fixed_in": null,
   "product_id": "llamaindex"
  }
 ],
 "category": "framework",
 "surface": [
  "dos"
 ],
 "kev": null,
 "fix": {
  "status": "fixed",
  "version": null,
  "url": "https://github.com/run-llama/llama_index/commit/d1ecfb77578d089cbe66728f18f635c09aa32a05"
 },
 "references": [
  {
   "url": "https://github.com/run-llama/llama_index/commit/d1ecfb77578d089cbe66728f18f635c09aa32a05",
   "source": "security@huntr.dev",
   "tags": [
    "Patch"
   ]
  }
 ],
 "related_agents": [
  "langchain-langchain",
  "langchain-langchain-deep-agents",
  "llamaindex-llamaindex"
 ],
 "related_incidents": [],
 "match": {
  "tests": [
   "A:name",
   "A:cpe"
  ],
  "terms": [
   "langchain:LangChain",
   "llamaindex:llamaindex:llamaindex"
  ]
 },
 "status": "candidate",
 "note": null,
 "reviewer": null,
 "checked_on": null,
 "retrieved_on": "2026-10-25"
}