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NATS has pre-auth server panic via leafnode handling

🗓️ 24 Mar 2026 21:45:29Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 3 Views

Pre-auth leafnode handling can crash NATS server from a malformed message; affected versions before 2.12.6 or 2.11.15; workaround: disable leafnode or restrict access.

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Refs
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25 Mar 202600:00
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CVE-2026-33218 NATS has pre-auth server panic via leafnode handling
25 Mar 202619:53
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OSV
BIT-NATS-2026-33218 NATS has pre-auth server panic via leafnode handling
27 Mar 202617:45
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Vulners
Node
OR
nats-ionats-serverRange2.12.0-RC.12.12.6go
OR
nats-ionats-serverRange<2.11.15go

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