ghsa-v676-f8gm-92r9
Vulnerability from github
Published
2025-09-12 06:30
Modified
2025-09-12 18:31
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Details
  1. A cookie is set using the secure keyword for https://target
  2. curl is redirected to or otherwise made to speak with http://target (same hostname, but using clear text HTTP) using the same cookie set
  3. The same cookie name is set - but with just a slash as path (path='/'). Since this site is not secure, the cookie should just be ignored.
  4. A bug in the path comparison logic makes curl read outside a heap buffer boundary

The bug either causes a crash or it potentially makes the comparison come to the wrong conclusion and lets the clear-text site override the contents of the secure cookie, contrary to expectations and depending on the memory contents immediately following the single-byte allocation that holds the path.

The presumed and correct behavior would be to plainly ignore the second set of the cookie since it was already set as secure on a secure host so overriding it on an insecure host should not be okay.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-9086"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-12T06:15:44Z",
    "severity": "HIGH"
  },
  "details": "1. A cookie is set using the `secure` keyword for `https://target`\n2. curl is redirected to or otherwise made to speak with `http://target` (same\n   hostname, but using clear text HTTP) using the same cookie set\n3. The same cookie name is set - but with just a slash as path (`path=\u0027/\u0027`).\n   Since this site is not secure, the cookie *should* just be ignored.\n4. A bug in the path comparison logic makes curl read outside a heap buffer\n   boundary\n\nThe bug either causes a crash or it potentially makes the comparison come to\nthe wrong conclusion and lets the clear-text site override the contents of the\nsecure cookie, contrary to expectations and depending on the memory contents\nimmediately following the single-byte allocation that holds the path.\n\nThe presumed and correct behavior would be to plainly ignore the second set of\nthe cookie since it was already set as secure on a secure host so overriding\nit on an insecure host should not be okay.",
  "id": "GHSA-v676-f8gm-92r9",
  "modified": "2025-09-12T18:31:09Z",
  "published": "2025-09-12T06:30:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-9086"
    },
    {
      "type": "WEB",
      "url": "https://hackerone.com/reports/3294999"
    },
    {
      "type": "WEB",
      "url": "https://curl.se/docs/CVE-2025-9086.html"
    },
    {
      "type": "WEB",
      "url": "https://curl.se/docs/CVE-2025-9086.json"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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