{
  "schema_version": "1.5.0",
  "id": "CURL-CVE-2026-80255",
  "aliases": [
    "CVE-2026-80255"
  ],
  "summary": "secure cookie attribute bypass with tab",
  "modified": "2026-08-28T09:03:47.00Z",
  "database_specific": {
    "package": "curl",
    "affects": "both",
    "URL": "https://curl.se/docs/CVE-2026-80255.json",
    "www": "https://curl.se/docs/CVE-2026-80255.html",
    "issue": "https://hackerone.com/reports/3972395",
    "CWE": {
      "id": "CWE-201",
      "desc": "Information Exposure Through Sent Data"
    },
    "last_affected": "8.21.0",
    "severity": "Low"
  },
  "published": "2026-09-02T08:00:00.00Z",
  "affected": [
    {
      "ranges": [
        {
           "type": "SEMVER",
           "events": [
             {"introduced": "8.13.0"},
             {"fixed": "8.22.0"}
           ]
        },
        {
           "type": "GIT",
           "repo": "https://github.com/curl/curl.git",
           "events": [
             {"introduced": "1aea05a6c2699e80c75936d58569851555acd603"},
             {"fixed": "4f6aa41a0145e930e766775dbe860883d350aa0a"}
           ]
        }
      ],
      "versions": [
        "8.21.0", "8.20.0", "8.19.0", "8.18.0", "8.17.0", "8.16.0", "8.15.0", 
        "8.14.1", "8.14.0", "8.13.0"
      ]
    }
  ],
  "credits": [
    {
      "name": "Stanislav Fort (Aisle Research)",
      "type": "FINDER"
    },
    {
      "name": "Daniel Stenberg",
      "type": "REMEDIATION_DEVELOPER"
    }
  ],
  "details": "A `Set-Cookie:` header using tab (horizontal tab, ASCII code 9) instead of\nspace (ascii code 32) immediately before the `Secure` attribute causes curl to\nstore the cookie without its Secure flag. The cookie might then wrongfully be\nsent over plaintext HTTP on subsequent requests to the same host."
}