{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "source": "REFERENCES"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "c467adf45c8d77ac4b92ad78b3eebf949252ba7f"
            }
          ],
          "repo": "https://github.com/vurtdev/net-oauth",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-c8rm-g5cm-4pf5"
  ],
  "database_specific": {
    "cna_assigner": "CPANSec",
    "cwe_ids": [
      "CWE-347",
      "CWE-757"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72889.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "fixed": "0.33"
          }
        ],
        "source": "AFFECTED_FIELD"
      },
      {
        "extracted_events": [
          {
            "fixed": "0.33"
          }
        ],
        "source": "DESCRIPTION"
      }
    ]
  },
  "details": "Net::OAuth versions before 0.33 for Perl allow the sender to choose the signature algorithm in verify.\n\nverify 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.\n\nA 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.",
  "id": "CVE-2026-72889",
  "modified": "2026-08-21T03:30:25.989435901Z",
  "published": "2026-08-19T07:20:09.095Z",
  "references": [
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/08/19/2"
    },
    {
      "type": "WEB",
      "url": "https://cpan.org/modules"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72889.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/vurtdev/Net-OAuth/security/advisories/GHSA-c8rm-g5cm-4pf5"
    },
    {
      "type": "ADVISORY",
      "url": "https://metacpan.org/release/RRWO/Net-OAuth-0.33/changes"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72889"
    },
    {
      "type": "FIX",
      "url": "https://github.com/vurtdev/Net-OAuth/commit/c467adf45c8d77ac4b92ad78b3eebf949252ba7f.patch"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/vurtdev/Net-OAuth"
    },
    {
      "type": "ARTICLE",
      "url": "https://datatracker.ietf.org/doc/html/rfc5849#section-3.4.2"
    },
    {
      "type": "ARTICLE",
      "url": "https://datatracker.ietf.org/doc/html/rfc5849#section-3.4.3"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "Net::OAuth versions before 0.33 for Perl allow the sender to choose the signature algorithm in verify"
}