{"id":"CVE-2020-26521","details":"The JWT library in NATS nats-server before 2.1.9 allows a denial of service (a nil dereference in Go code).","aliases":["GHSA-h2fg-54x9-5qhq","GHSA-hmm9-r2m2-qg9w","GO-2022-0402"],"modified":"2026-04-11T12:34:06.548066Z","published":"2020-11-06T08:15:13.563Z","related":["CGA-2v6p-mg24-q4w7"],"database_specific":{"unresolved_ranges":[{"source":"CPE_FIELD","extracted_events":[{"last_affected":"33"}],"cpe":"cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*"}]},"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VT67XCLIIBYRT762SVFBYFFTQFVSM3SI/"},{"type":"ADVISORY","url":"http://www.openwall.com/lists/oss-security/2020/11/02/2"},{"type":"FIX","url":"https://github.com/nats-io/nats-server/commits/master"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/nats-io/nats-server","events":[{"introduced":"0"},{"fixed":"7c7662603115c1f53a9bacfa0115893c8ebe6fd4"}],"database_specific":{"source":"CPE_FIELD","extracted_events":[{"introduced":"0"},{"fixed":"2.1.9"}],"cpe":"cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*"}}],"versions":["v0.5.1","v0.5.2","v0.5.4","v0.5.6","v0.6.0","v0.6.2","v0.6.4","v0.6.6","v0.6.8","v0.7.0","v0.7.2","v0.8.0","v0.8.1","v0.9.2","v0.9.4","v0.9.6","v1.0.0","v1.0.2","v1.0.4","v1.0.6","v1.1.0","v1.2.0","v1.3.0","v2.0.0","v2.0.0-RC14","v2.0.0-RC19","v2.0.2","v2.0.4","v2.1.0","v2.1.2","v2.1.4","v2.1.6","v2.1.7","v2.1.8"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2020-26521.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}