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CVE-2026-29785

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-29785

Severity

7.5

High

CVSS V3

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Summary

NATS Server panic via malicious compression on leafnode port

Description

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.14 and 2.12.5, if the nats-server has the "leafnode" configuration enabled (not default), then anyone who can connect can crash the nats-server by triggering a panic. This happens pre-authentication and requires that compression be enabled (which it is, by default, when leafnodes are used). Versions 2.11.14 and 2.12.5 contain a fix. As a workaround, disable compression on the leafnode port.

References

Affected packages

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