{"id":"CVE-2026-58250","title":"NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system","summary":"NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.12.8 and 2.11.17, an unauthenticated peer with network access to a leafnode listener with compression enabled could crash the se…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-476"],"vendor":"linuxfoundation","product":"nats-server","affected":["nats-server < 2.11.17","nats-server >= 2.12.0, < 2.12.8"],"patched":["nats-server 2.12.8"],"published":"2026-07-08","updated":"2026-07-13","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-58250","references":[{"url":"https://github.com/nats-io/nats-server/commit/8dcb26eaea78fdcbe96dbee5986d6019fd5cb94a","label":"security-advisories@github.com"},{"url":"https://github.com/nats-io/nats-server/commit/fc5fe39177533e9dbdd651d2458285bfae1dde27","label":"security-advisories@github.com"},{"url":"https://github.com/nats-io/nats-server/releases/tag/v2.11.17","label":"security-advisories@github.com"},{"url":"https://github.com/nats-io/nats-server/releases/tag/v2.12.8","label":"security-advisories@github.com"},{"url":"https://github.com/nats-io/nats-server/security/advisories/GHSA-3g5q-cfh2-cq67","label":"security-advisories@github.com"}],"tags":["nvd"],"epss":0.00742,"epssPercentile":0.52763,"ingestedAt":"2026-07-13T15:27:34.264Z","slug":"CVE-2026-58250","body":"## Overview\n\nNATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.12.8 and 2.11.17, an unauthenticated peer with network access to a leafnode listener with compression enabled could crash the server during the pre-authentication leafnode handshake by sending repeated leafnode INFO protocol messages before authentication and account setup completed. This issue is fixed in versions 2.12.8 and 2.11.17.\n\n## Affected\n\n- `nats-server < 2.11.17`\n- `nats-server >= 2.12.0, < 2.12.8`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `nats-server 2.12.8`","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}