{
  "cveId": "CVE-2023-27537",
  "url": "https://patchblox.com/security/cve/CVE-2023-27537",
  "summary": "CVE-2023-27537 is fixed in 10 products on 1 platform, first by DEBIAN-CVE-2023-27537, released March 30, 2023. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "curl: A double free vulnerability exists in libcurl \u003C8.0.0 when sharing HSTS data between separate \u0022handles\u0022",
  "description": "A double free vulnerability exists in libcurl \u003C8.0.0 when sharing HSTS data between separate \u0022handles\u0022. This sharing was introduced without considerations for do this sharing across separate threads but there was no indication of this fact in the documentation. Due to missing mutexes or thread locks, two threads sharing the same HSTS data could end up doing a double-free or use-after-free.",
  "published": "2023-03-30T20:15:07Z",
  "severity": "medium",
  "cvss": 5.9,
  "cvssVector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.01898,
  "epssPercentile": 0.79792,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "curl",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "7.88.1-7",
      "fix": "DEBIAN-CVE-2023-27537",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-27537",
      "released": "2023-03-30T20:15:07Z"
    },
    {
      "platform": "linux",
      "product": "curl",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "7.88.1-7",
      "fix": "DEBIAN-CVE-2023-27537",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-27537",
      "released": "2023-03-30T20:15:07Z"
    },
    {
      "platform": "linux",
      "product": "curl",
      "release": "Debian 14",
      "fixedVersion": "7.88.1-7",
      "fix": "DEBIAN-CVE-2023-27537",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-27537",
      "released": "2023-03-30T20:15:07Z"
    },
    {
      "platform": "linux",
      "product": "curl",
      "release": "amzn 2023",
      "fixedVersion": "8.0.1-1.amzn2023",
      "fix": "ALAS2023-2023-193",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-193",
      "released": "2023-06-05T16:38:00Z"
    },
    {
      "platform": "linux",
      "product": "curl-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "8.0.1-1.amzn2023",
      "fix": "ALAS2023-2023-193",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-193",
      "released": "2023-06-05T16:38:00Z"
    },
    {
      "platform": "linux",
      "product": "curl-debugsource",
      "release": "amzn 2023",
      "fixedVersion": "8.0.1-1.amzn2023",
      "fix": "ALAS2023-2023-193",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-193",
      "released": "2023-06-05T16:38:00Z"
    },
    {
      "platform": "linux",
      "product": "curl-minimal",
      "release": "amzn 2023",
      "fixedVersion": "8.0.1-1.amzn2023",
      "fix": "ALAS2023-2023-193",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-193",
      "released": "2023-06-05T16:38:00Z"
    },
    {
      "platform": "linux",
      "product": "curl-minimal-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "8.0.1-1.amzn2023",
      "fix": "ALAS2023-2023-193",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-193",
      "released": "2023-06-05T16:38:00Z"
    },
    {
      "platform": "linux",
      "product": "libcurl",
      "release": "amzn 2023",
      "fixedVersion": "8.0.1-1.amzn2023",
      "fix": "ALAS2023-2023-193",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-193",
      "released": "2023-06-05T16:38:00Z"
    },
    {
      "platform": "linux",
      "product": "libcurl-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "8.0.1-1.amzn2023",
      "fix": "ALAS2023-2023-193",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-193",
      "released": "2023-06-05T16:38:00Z"
    },
    {
      "platform": "linux",
      "product": "libcurl-devel",
      "release": "amzn 2023",
      "fixedVersion": "8.0.1-1.amzn2023",
      "fix": "ALAS2023-2023-193",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-193",
      "released": "2023-06-05T16:38:00Z"
    },
    {
      "platform": "linux",
      "product": "libcurl-minimal",
      "release": "amzn 2023",
      "fixedVersion": "8.0.1-1.amzn2023",
      "fix": "ALAS2023-2023-193",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-193",
      "released": "2023-06-05T16:38:00Z"
    },
    {
      "platform": "linux",
      "product": "libcurl-minimal-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "8.0.1-1.amzn2023",
      "fix": "ALAS2023-2023-193",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-193",
      "released": "2023-06-05T16:38:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}