{"action":"Upgrade cbor2 to 5.9.0 or later.","affected":[{"fixed":"5.9.0","introduced":"0"}],"component":"cbor2","cve_ids":["CVE-2026-26209"],"ecosystem":"PyPI","epss":0.00397,"exploited":false,"fixed_versions":["5.9.0"],"ghsa_id":"GHSA-3c37-wwvx-h642","id":"tcs_01M5KEVF7P74E985K4FZ6JMYMY","modified_at":"2026-09-10T03:50:36.691215585Z","published_at":"2026-03-23T20:23:57Z","references":["https://osv.dev/vulnerability/GHSA-3c37-wwvx-h642","https://github.com/agronholm/cbor2/security/advisories/GHSA-3c37-wwvx-h642","https://nvd.nist.gov/vuln/detail/CVE-2026-26209","https://github.com/agronholm/cbor2/pull/275","https://github.com/agronholm/cbor2/commit/e61a5f365ba610d5907a0ae1bc72769bba34294b","https://github.com/agronholm/cbor2","https://github.com/agronholm/cbor2/releases/tag/5.9.0"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"GHSA-3c37-wwvx-h642","url":"https://osv.dev/vulnerability/GHSA-3c37-wwvx-h642"}],"summary":"cbor2 has a Denial of Service via Uncontrolled Recursion in cbor2.loads"}