{"id":"CVE-2026-28802","title":"Authlib is a Python library which builds OAuth and OpenID Connect servers","summary":"Authlib is a Python library which builds OAuth and OpenID Connect servers. From version 1.6.5 to before version 1.6.7, previous tests involving passing a malicious JWT containing alg: none and an empty signature was passing the signature…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-347"],"vendor":"authlib","product":"authlib","affected":["authlib >= 1.6.5, < 1.6.7"],"patched":["authlib 1.6.7"],"published":"2026-03-06","updated":"2026-09-10","sourceUpdated":"2026-09-10T13:18:02.380","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-28802","references":[{"url":"https://github.com/authlib/authlib/commit/a61c2acb807496e67f32051b5f1b1d5ccf8f0a75","label":"security-advisories@github.com"},{"url":"https://github.com/authlib/authlib/commit/b87c32ed07b8ae7f805873e1c9cafd1016761df7","label":"security-advisories@github.com"},{"url":"https://github.com/authlib/authlib/security/advisories/GHSA-7wc2-qxgw-g8gg","label":"security-advisories@github.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:19375","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:4942","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:5168","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:5665","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:6309","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/errata/RHSA-2026:6568","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/security/cve/CVE-2026-28802","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2445120","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-28802.json","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-28802"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-28802"},{"url":"https://github.com/authlib/authlib"}],"tags":["nvd","cve.org","csaf","vex","red-hat","osv","pip","score-dispute"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-03-06T16:00:04.267898Z"},"scores":{"nvd":9.8,"cna":7.7,"vendor":9.1},"epss":0.00425,"epssPercentile":0.36293,"ingestedAt":"2026-07-01T15:50:58.581Z","aliases":["GHSA-7wc2-qxgw-g8gg","PYSEC-2026-2118"],"ecosystem":"pip","slug":"CVE-2026-28802","body":"## Overview\n\nAuthlib is a Python library which builds OAuth and OpenID Connect servers. From version 1.6.5 to before version 1.6.7, previous tests involving passing a malicious JWT containing alg: none and an empty signature was passing the signature verification step without any changes to the application code when a failure was expected.. This issue has been patched in version 1.6.7.\n\n## Affected\n\n- `authlib >= 1.6.5, < 1.6.7`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `authlib 1.6.7`\n\n## Vendor advisories\n\n- **RHSA-2026:6309** · Red Hat · fixed in: Red Hat Ansible Automation Platform 2.6 · released 2026-03-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:6309)\n- **RHSA-2026:5665** · Red Hat · fixed in: Red Hat Quay 3.10 · released 2026-03-24 · [advisory](https://access.redhat.com/errata/RHSA-2026:5665)\n- **RHSA-2026:4942** · Red Hat · fixed in: Red Hat Quay 3.12 · released 2026-03-18 · [advisory](https://access.redhat.com/errata/RHSA-2026:4942)\n- **RHSA-2026:6568** · Red Hat · fixed in: Red Hat Quay 3.15 · released 2026-04-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:6568)\n- **RHSA-2026:19375** · Red Hat · fixed in: Red Hat Quay 3.16 · released 2026-05-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:19375)\n- **RHSA-2026:5168** · Red Hat · fixed in: Red Hat Quay 3.9 · released 2026-03-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:5168)\n- **Red Hat VEX** · Important · affected: Red Hat Satellite 6 · no fix planned: Red Hat Satellite 6 · updated 2026-09-09 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-28802.json)\n\n## Package advisory (CVE-2026-28802)\n\nAffected packages:\n\n- `authlib >= 1.6.5, < 1.6.7`\n\nPatched in:\n\n- `authlib 1.6.7`\n\nSource: https://osv.dev/vulnerability/GHSA-7wc2-qxgw-g8gg","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}