{"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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