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nats-io — Vulnerabilities & Security Advisories 28

Browse all 28 CVE security advisories affecting nats-io. AI-powered Chinese analysis, POCs, and references for each vulnerability.

NATS is an open-source messaging system focused on high-performance event streaming and microservices communication. Historically, vulnerabilities have included remote code execution, cross-site scripting, and privilege escalation, often stemming from improper input validation and authentication flaws. The project has addressed security through regular updates and a bug bounty program. While no major public incidents have been widely documented, the 16 recorded CVEs highlight potential risks in default configurations and third-party integrations. Security teams should prioritize hardening deployments, applying patches promptly, and implementing network segmentation to mitigate exposure.

Top products by nats-io: nats-server nkeys
CVE ID Title CVSS Severity Published
CVE-2026-58208 NATS Server: MQTT-over-WebSocket Path Can Crash WebSocket-Only JetStream Servers Before MQTT Is Enabled — nats-server CWE-248 6.8 Medium 2026-07-08
CVE-2026-58211 NATS Server: `no_auth_user` pre-CONNECT fast path bypasses user connection restrictions — nats-server CWE-863 5.4 Medium 2026-07-08
CVE-2026-58207 NATS Server: Remote crash via integer overflow in Connz pagination — nats-server CWE-190 7.7 High 2026-07-08
CVE-2026-58210 NATS Server: MQTT partial CONNECT packets can exhaust pre-auth memory — nats-server CWE-400 7.5 High 2026-07-08
CVE-2026-58209 NATS Server: MQTT retained and QoS replay bypass subscribe deny filters — nats-server CWE-863 4.3 Medium 2026-07-08
CVE-2026-58214 NATS Server: MQTT subscribe ACL bypass via $MQTT.deliver.pubrel prefix (incomplete fix for CVE-2026-33217) — nats-server CWE-863 4.3 Medium 2026-07-08
CVE-2026-58254 NATS Server: Incomplete fix for CVE-2026-33249: Leaf node connections bypass Nats-Trace-Dest permission check — nats-server CWE-863 - - 2026-07-08
CVE-2026-58213 NATS Server: MQTT SUBSCRIBE Protocol Injection via Leaf Node/Route Forwarding allows arbitrary NATS command injection — nats-server CWE-74 7.1 High 2026-07-08
CVE-2026-58250 NATS Server: Pre-auth server crash via double INFO in leafnode handshake — nats-server CWE-476 7.5 High 2026-07-08
CVE-2026-58252 NATS Server: Subscribe Authz Bypass via Wildcard-Overlap — nats-server CWE-285 6.5 Medium 2026-07-08
CVE-2026-58253 NATS Server: Route API Auth Bypass — nats-server CWE-287 8.8 High 2026-07-08
CVE-2026-58251 NATS Server: Queue Subscribe Authz Bypass — nats-server CWE-285 6.5 Medium 2026-07-08
CVE-2026-33249 NATS: Message tracing can be redirected to arbitrary subject — nats-server CWE-863 4.3 Medium 2026-03-25
CVE-2026-33223 NATS Server: Incomplete Stripping of Nats-Request-Info Header Allows Identity Spoofing — nats-server CWE-290 6.4 Medium 2026-03-25
CVE-2026-33248 NATS has mTLS verify_and_map authentication bypass via incorrect Subject DN matching — nats-server CWE-287 4.2 Medium 2026-03-25
CVE-2026-33222 NATS JetStream has an authorization bypass through its Management API — nats-server CWE-285 4.9 Medium 2026-03-25
CVE-2026-33247 NATS credentials are exposed in monitoring port via command-line argv — nats-server CWE-215 7.4 High 2026-03-25
CVE-2026-33219 NATS is vulnerable to pre-auth DoS through WebSockets client service — nats-server CWE-770 5.3 Medium 2026-03-25
CVE-2026-33218 NATS has pre-auth server panic via leafnode handling — nats-server CWE-20 7.5 High 2026-03-25
CVE-2026-33246 NATS: Leafnode connections allow spoofing of Nats-Request-Info identity headers — nats-server CWE-287 6.4 Medium 2026-03-25
CVE-2026-33217 NATS allows MQTT clients to bypass ACL checks — nats-server CWE-863 7.1 High 2026-03-25
CVE-2026-33216 NATS has MQTT plaintext password disclosure — nats-server CWE-256 8.6 High 2026-03-25
CVE-2026-29785 NATS Server panic via malicious compression on leafnode port — nats-server CWE-476 7.5 High 2026-03-25
CVE-2026-27889 NATS: Pre-auth remote server crash via WebSocket frame length overflow in wsRead — nats-server CWE-190 7.5 High 2026-03-25
CVE-2026-33215 NATS is vulnerable to MQTT hijacking via Client ID — nats-server CWE-287 6.5 Medium 2026-03-24
CVE-2026-27571 nats-server websockets are vulnerable to pre-auth memory DoS — nats-server CWE-409 5.9 Medium 2026-02-24
CVE-2025-30215 NATS-Server Fails to Authorize Certain Jetstream Admin APIs — nats-server CWE-306 9.6 Critical 2025-04-15
CVE-2023-46129 xkeys Seal encryption used fixed key for all encryption — nkeys CWE-321 7.5 High 2023-10-30

This page lists every published CVE security advisory associated with nats-io. Each entry links to a detailed page with CVSS scoring, CWE classification, affected products and references. AI-generated Chinese analysis is provided for fast triage.