{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "1.3.4"
              },
              {
                "fixed": "1.6.5"
              }
            ],
            "source": [
              "DESCRIPTION",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "6b6642b7e0f13cb6d8dc4541c1d68ff8523ccf27"
            },
            {
              "fixed": "881712980934fb601bed26fe3ae1ec0b7780e6f7"
            },
            {
              "fixed": "1e5b94da589c695f54abd9f1a0ad822dcffe0305"
            }
          ],
          "repo": "https://github.com/authlib/joserfc",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-wphv-vfrh-23q5"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-400",
      "CWE-770"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48990.json"
  },
  "details": "joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. In versions 1.3.4 through 1.6.5, joserfc accepts oversized RFC7797 b64=false JWS payloads without applying JWSRegistry.max_payload_length, which can lead to resource exhaustion. The normal JWS compact and flattened JSON paths reject payloads above the configured payload-size limit with ExceededSizeError. The RFC7797 unencoded payload paths do not make the same check. A valid b64=false compact or flattened JSON JWS can therefore deserialize successfully with a payload larger than JWSRegistry.max_payload_length. Applications that accept lower-trust JWS values and rely on joserfc to reject oversized token content during verification have a moderate availability risk. This issue has been fixed in version 1.6.7.",
  "id": "CVE-2026-48990",
  "modified": "2026-07-15T01:48:55.382619868Z",
  "published": "2026-06-17T21:08:10.534Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/authlib/joserfc/releases/tag/1.6.7"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48990.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/authlib/joserfc/security/advisories/GHSA-wphv-vfrh-23q5"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-48990"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "joserfc: b64=false RFC7797 JWS payloads bypass JWSRegistry payload-size limits during deserialization"
}