{"schemaVersion":3,"id":"CVE-2026-33248","aliases":["UBUNTU-CVE-2026-33248","DEBIAN-CVE-2026-33248","CGA-2cv4-4rjc-g82j","CGA-2hmq-4qmv-gxrp","CGA-3pg7-4c8w-q924","CGA-4qq2-vp64-q627","CGA-5mch-j5q7-525f","CGA-5xmj-37fx-h428","CGA-62xp-3726-rqgv","CGA-6588-v2pj-57v4","CGA-67jp-x3hr-xvjm","CGA-7fx9-5278-qr65","CGA-8r97-fjqw-ph8c","CGA-99m2-x49p-qpmm","CGA-c73m-3vp7-h43g","CGA-frw2-wcgg-8xwc","CGA-hvpx-4cxj-c594","CGA-m8ph-78wj-4qx5","CGA-qw26-22qc-3fqx","CGA-rmh2-m24p-hwv3","CGA-v433-36c9-6vj9","CGA-vrvh-cj46-4h55","CGA-wcm7-xh85-q7hg","CGA-wgj3-49cj-wc4r","CGA-x6gv-922g-gmq8","CGA-xvv6-m299-25h8","GHSA-3f24-pcvm-5jqc","BIT-nats-2026-33248","GO-2026-4828","CGA-3ff3-676p-hq98","CGA-474x-vg7c-p2cv","CGA-4784-q234-fqmv","CGA-4jgm-f55v-86wp","CGA-59v7-c45q-372w","CGA-6c7m-v3px-ch24","CGA-6fg5-3hj4-p7c4","CGA-74wp-r634-m5cg","CGA-8q9v-jh3c-r4vg","CGA-9f47-crq3-4f4m","CGA-crrm-7g6j-fc37","CGA-f9vv-rrpv-xxrg","CGA-gw62-2r87-4c8g","CGA-hf9f-xvrv-55wj","CGA-hfr7-ppjv-vj6x","CGA-hm72-7jhq-6wc8","CGA-j833-5fm2-mm96","CGA-jq8x-6qpp-gjh9","CGA-m8pw-973m-3j8w","CGA-phf4-76w8-j6qx","CGA-pphq-hg9q-976w","CGA-q8hr-89cc-3vw7","CGA-qjh7-m26g-3xcf","CGA-rp29-cv55-jrjc","CGA-rr3h-hrcq-q8j4","CGA-vvgh-c6xc-2f4g","CGA-wv5p-r438-c69h","CGA-wx7h-26rv-3jmq","CGA-x428-9cvf-cf25","CGA-x5cj-qpwv-f8cr","CGA-x7xv-wj86-rj2m","CGA-xggm-q75w-82c5"],"status":"published","duplicateOf":null,"title":null,"description":"NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, when using mTLS for client identity, with `verify_and_map` to derive a NATS identity from the client certificate's Subject DN, certain patterns of RDN would not be correctly enforced, allowing for authentication bypass. This does require a valid certificate from a CA already trusted for client certificates, and `DN` naming patterns which the NATS maintainers consider highly unlikely. So this is an unlikely attack. Nonetheless, administrators who have been very sophisticated in their `DN` construction patterns might conceivably be impacted. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, developers should review their CA issuing practices.","dates":{"published":"2026-03-25T20:18:28.923Z","modified":"2026-03-26T19:52:12.357Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":4.2,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":4.2,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":4.2,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N","exploitability":4.1,"impact":4.2,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · 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