{
  "threat_severity" : "Moderate",
  "public_date" : "2026-06-17T21:08:10Z",
  "bugzilla" : {
    "description" : "joserfc: joserfc: Resource exhaustion via oversized JSON Web Signature (JWS) payloads",
    "id" : "2490168",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2490168"
  },
  "cvss3" : {
    "cvss3_base_score" : "5.3",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
    "status" : "draft"
  },
  "cwe" : "CWE-770",
  "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.", "A flaw was found in joserfc, a Python library for JSON Object Signing and Encryption (JOSE). This vulnerability allows a remote attacker to cause resource exhaustion, leading to a Denial of Service (DoS), by sending oversized JSON Web Signature (JWS) payloads. The library fails to apply size limits, specifically JWSRegistry.max_payload_length, when processing RFC7797 b64=false JWS payloads." ],
  "package_state" : [ {
    "product_name" : "Migration Toolkit for Applications 8",
    "fix_state" : "Affected",
    "package_name" : "mta/mta-solution-server-rhel9",
    "cpe" : "cpe:/a:redhat:migration_toolkit_applications:8"
  }, {
    "product_name" : "Red Hat Ansible Automation Platform 2",
    "fix_state" : "Affected",
    "package_name" : "ansible-automation-platform-26/lightspeed-chatbot-rhel9",
    "cpe" : "cpe:/a:redhat:ansible_automation_platform:2"
  }, {
    "product_name" : "Red Hat Ansible Automation Platform 2",
    "fix_state" : "Affected",
    "package_name" : "ansible-automation-platform-27/lightspeed-chatbot-rhel9",
    "cpe" : "cpe:/a:redhat:ansible_automation_platform:2"
  }, {
    "product_name" : "Red Hat Hardened Images",
    "fix_state" : "Affected",
    "package_name" : "jaeger",
    "cpe" : "cpe:/a:redhat:hummingbird:1"
  }, {
    "product_name" : "Red Hat Satellite 6",
    "fix_state" : "Not affected",
    "package_name" : "satellite/foreman-mcp-server-rhel9",
    "cpe" : "cpe:/a:redhat:satellite:6"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-48990\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-48990\nhttps://github.com/authlib/joserfc/releases/tag/1.6.7\nhttps://github.com/authlib/joserfc/security/advisories/GHSA-wphv-vfrh-23q5" ],
  "name" : "CVE-2026-48990",
  "mitigation" : {
    "value" : "The risk can be mitigated by rejecting oversized serialized JWS inputs before they reach joserfc and enforcing strict request/body size limits at the application or reverse-proxy layer.",
    "lang" : "en:us"
  },
  "csaw" : false
}