{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-48990", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-05-26T23:26:07.975Z", "datePublished": "2026-06-17T21:08:10.534Z", "dateUpdated": "2026-06-18T12:51:59.900Z"}, "containers": {"cna": {"title": "joserfc: b64=false RFC7797 JWS payloads bypass JWSRegistry payload-size limits during deserialization", "problemTypes": [{"descriptions": [{"cweId": "CWE-400", "lang": "en", "description": "CWE-400: Uncontrolled Resource Consumption", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-770", "lang": "en", "description": "CWE-770: Allocation of Resources Without Limits or Throttling", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}}], "references": [{"name": "https://github.com/authlib/joserfc/security/advisories/GHSA-wphv-vfrh-23q5", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/authlib/joserfc/security/advisories/GHSA-wphv-vfrh-23q5"}, {"name": "https://github.com/authlib/joserfc/releases/tag/1.6.7", "tags": ["x_refsource_MISC"], "url": "https://github.com/authlib/joserfc/releases/tag/1.6.7"}], "affected": [{"vendor": "authlib", "product": "joserfc", "versions": [{"version": "< 1.6.7", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-06-17T21:08:10.534Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-wphv-vfrh-23q5", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/authlib/joserfc/security/advisories/GHSA-wphv-vfrh-23q5", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-06-18T12:51:44.745917Z", "id": "CVE-2026-48990", "options": [{"Exploitation": "poc"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-18T12:51:59.900Z"}}]}}

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{"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"}, "csaw": false, "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": ["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."], "mitigation": {"lang": "en:us", "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."}, "name": "CVE-2026-48990", "package_state": [{"cpe": "cpe:/a:redhat:migration_toolkit_applications:8", "fix_state": "Affected", "package_name": "mta/mta-solution-server-rhel9", "product_name": "Migration Toolkit for Applications 8"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Affected", "package_name": "ansible-automation-platform-26/lightspeed-chatbot-rhel9", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Affected", "package_name": "ansible-automation-platform-27/lightspeed-chatbot-rhel9", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "jaeger", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Not affected", "package_name": "satellite/foreman-mcp-server-rhel9", "product_name": "Red Hat Satellite 6"}], "public_date": "2026-06-17T21:08:10Z", "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"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.6.7)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "joserfc", "source": "cna", "vendor": "authlib"}, "product": "joserfc", "vendor": "authlib"}], "created": "2026-06-18T19:30:15.321870+00:00", "updated": "2026-06-18T19:30:15.423639+00:00", "vendors": ["authlib", "authlib$PRODUCT$joserfc"]}