{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "8.13.0"
              },
              {
                "fixed": "8.22.0"
              }
            ],
            "source": "CPE_RANGE"
          },
          "events": [
            {
              "introduced": "1c3149881769e7bd79b072e48374e4c2b3678b2f"
            },
            {
              "fixed": "01346829096c61b372692f6dc43ffa778c6caccd"
            }
          ],
          "repo": "https://github.com/curl/curl",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "curl",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80255.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "8.21.0"
          },
          {
            "last_affected": "8.21.0"
          },
          {
            "introduced": "8.20.0"
          },
          {
            "last_affected": "8.20.0"
          },
          {
            "introduced": "8.19.0"
          },
          {
            "last_affected": "8.19.0"
          },
          {
            "introduced": "8.18.0"
          },
          {
            "last_affected": "8.18.0"
          },
          {
            "introduced": "8.17.0"
          },
          {
            "last_affected": "8.17.0"
          },
          {
            "introduced": "8.16.0"
          },
          {
            "last_affected": "8.16.0"
          },
          {
            "introduced": "8.15.0"
          },
          {
            "last_affected": "8.15.0"
          },
          {
            "introduced": "8.14.1"
          },
          {
            "last_affected": "8.14.1"
          },
          {
            "introduced": "8.14.0"
          },
          {
            "last_affected": "8.14.0"
          },
          {
            "introduced": "8.13.0"
          },
          {
            "last_affected": "8.13.0"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "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.",
  "id": "CVE-2026-80255",
  "modified": "2026-09-13T03:30:22.557061759Z",
  "published": "2026-09-06T17:48:54.275Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://curl.se/docs/CVE-2026-80255.html"
    },
    {
      "type": "WEB",
      "url": "https://curl.se/docs/CVE-2026-80255.json"
    },
    {
      "type": "WEB",
      "url": "https://hackerone.com/reports/3972395"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80255.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80255"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "secure cookie attribute bypass with tab"
}