{
  "cveId": "CVE-2026-9537",
  "url": "https://patchblox.com/security/cve/CVE-2026-9537",
  "summary": "CVE-2026-9537 is fixed in libmojo-jwt-perl on 1 platform by DEBIAN-CVE-2026-9537 (version 1.02-1), released July 18, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "libmojo-jwt-perl: Mojo::JWT versions before 1.02 for Perl verify HMAC signatures with a non-constant-time string comparison",
  "description": "Mojo::JWT versions before 1.02 for Perl verify HMAC signatures with a non-constant-time string comparison.  The decode() method compares the supplied signature to the recomputed HMAC with Perl\u0027s eq operator, which stops at the first differing byte, so the comparison time varies with the number of matching leading bytes.  A caller that decodes attacker supplied tokens leaks the expected signature through this timing variation, which can be aggregated over many requests to recover the signature and forge a token.",
  "published": "2026-07-17T16:17:20Z",
  "severity": "medium",
  "cvss": 5.3,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
  "epss": 0.00322,
  "epssPercentile": 0.25406,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "libmojo-jwt-perl",
      "release": "Debian 14",
      "fixedVersion": "1.02-1",
      "fix": "DEBIAN-CVE-2026-9537",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-9537",
      "released": "2026-07-18T12:42:52Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}