VYPR
High severityNVD Advisory· Published Mar 25, 2026· Updated Mar 28, 2026

NATS Server panic via malicious compression on leafnode port

CVE-2026-29785

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
github.com/nats-io/nats-server/v2Go
< 2.11.142.11.14
github.com/nats-io/nats-server/v2Go
>= 2.12.0-RC.1, < 2.12.52.12.5
github.com/nats-io/nats-serverGo
>= 0

Affected products

37

Patches

Vulnerability mechanics

References

5

News mentions

0

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