{
  "schema_version": "1.5.0",
  "id": "CURL-CVE-2018-16890",
  "aliases": [
    "CVE-2018-16890"
  ],
  "summary": "NTLM type-2 out-of-bounds buffer read",
  "modified": "2026-04-25T17:48:46.00Z",
  "database_specific": {
    "package": "curl",
    "affects": "both",
    "URL": "https://curl.se/docs/CVE-2018-16890.json",
    "www": "https://curl.se/docs/CVE-2018-16890.html",
    "CWE": {
      "id": "CWE-125",
      "desc": "Out-of-bounds Read"
    },
    "last_affected": "7.63.0",
    "severity": "Medium"
  },
  "published": "2019-02-06T08:00:00.00Z",
  "affected": [
    {
      "ranges": [
        {
           "type": "SEMVER",
           "events": [
             {"introduced": "7.36.0"},
             {"fixed": "7.64.0"}
           ]
        },
        {
           "type": "GIT",
           "repo": "https://github.com/curl/curl.git",
           "events": [
             {"introduced": "86724581b6c02d160b52f817550cfdfc9c93af62"},
             {"fixed": "b780b30d1377adb10bbe774835f49e9b237fb9bb"}
           ]
        }
      ],
      "versions": [
        "7.63.0", "7.62.0", "7.61.1", "7.61.0", "7.60.0", "7.59.0", "7.58.0", 
        "7.57.0", "7.56.1", "7.56.0", "7.55.1", "7.55.0", "7.54.1", "7.54.0", 
        "7.53.1", "7.53.0", "7.52.1", "7.52.0", "7.51.0", "7.50.3", "7.50.2", 
        "7.50.1", "7.50.0", "7.49.1", "7.49.0", "7.48.0", "7.47.1", "7.47.0", 
        "7.46.0", "7.45.0", "7.44.0", "7.43.0", "7.42.1", "7.42.0", "7.41.0", 
        "7.40.0", "7.39.0", "7.38.0", "7.37.1", "7.37.0", "7.36.0"
      ]
    }
  ],
  "credits": [
    {
      "name": "Wenxiang Qian of Tencent Blade Team",
      "type": "FINDER"
    },
    {
      "name": "Daniel Stenberg",
      "type": "REMEDIATION_DEVELOPER"
    }
  ],
  "details": "libcurl contains a heap buffer out-of-bounds read flaw.\n\nThe function handling incoming NTLM type-2 messages\n(`lib/vauth/ntlm.c:ntlm_decode_type2_target`) does not validate incoming data\ncorrectly and is subject to an integer overflow vulnerability.\n\nUsing that overflow, a malicious or broken NTLM server could trick libcurl to\naccept a bad length + offset combination that would lead to a buffer read\nout-of-bounds."
}