{
  "cveId": "CVE-2026-72889",
  "url": "https://patchblox.com/security/cve/CVE-2026-72889",
  "summary": "CVE-2026-72889 is fixed in libnet-oauth-perl on 1 platform by DEBIAN-CVE-2026-72889 (version 0.33-1), released August 29, 2026. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "libnet-oauth-perl: Net::OAuth versions before 0.33 for Perl allow the sender to choose the signature algorithm in verify",
  "description": "Net::OAuth versions before 0.33 for Perl allow the sender to choose the signature algorithm in verify.  verify resolves the signature method class from the signature_method parameter of the incoming message. signature_method is required on every request, so the algorithm used to check a signature is chosen by whoever sent it, and nothing lets the verifying party pin the method instead. When a message names HMAC-SHA1 or HMAC-SHA256, the key is derived from consumer_secret and token_secret rather than from the key the provider deployed.  A provider deployed on RSA-SHA1 holds only the consumer public key, and RFC 5849 does not use consumer_secret for that method, so the required parameter is filled with a placeholder. A client that names HMAC-SHA1 instead has its signature checked against that placeholder, so a guessable one is enough to forge requests for any consumer key and token.",
  "published": "2026-08-19T08:17:13Z",
  "severity": "critical",
  "cvss": 9.8,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00448,
  "epssPercentile": 0.39249,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "libnet-oauth-perl",
      "release": "Debian 14",
      "fixedVersion": "0.33-1",
      "fix": "DEBIAN-CVE-2026-72889",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-72889",
      "released": "2026-08-29T00:46:20Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-10T01:44:33Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}