{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9266eaa2227ad7e21dc731b2a4a01909aabd934b"
            }
          ],
          "repo": "https://github.com/authlib/authlib",
          "type": "GIT"
        }
      ]
    },
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "0"
              },
              {
                "fixed": "1.6.9"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9266eaa2227ad7e21dc731b2a4a01909aabd934b"
            }
          ],
          "repo": "https://github.com/lepture/authlib",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-7432-952r-cw78"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-203",
      "CWE-327"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28490.json"
  },
  "details": "Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a cryptographic padding oracle vulnerability was identified in the Authlib Python library concerning the implementation of the JSON Web Encryption (JWE) RSA1_5 key management algorithm. Authlib registers RSA1_5 in its default algorithm registry without requiring explicit opt-in, and actively destroys the constant-time Bleichenbacher mitigation that the underlying cryptography library implements correctly. This issue has been patched in version 1.6.9.",
  "id": "CVE-2026-28490",
  "modified": "2026-04-01T23:08:20.501316779Z",
  "published": "2026-03-16T17:37:57.425Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/authlib/authlib/releases/tag/v1.6.9"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28490.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/authlib/authlib/security/advisories/GHSA-7432-952r-cw78"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-28490"
    },
    {
      "type": "FIX",
      "url": "https://github.com/authlib/authlib/commit/48b345f29f6c459f11c6a40162b6c0b742ef2e22"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Authlib Vulnerable to JWE RSA1_5 Bleichenbacher Padding Oracle"
}