Vulnerabilities CVE-2026-29785

CVE-2026-29785

High

Open

TLP:CLEAR

NATS Server panic via malicious compression on leafnode port

NVD CVE.org

Critical Infrastructure

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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.

Details

CVSS Score: 7.5
EPSS Score ⓘ: 0.66%

48.3th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Confidence: 90%
Published: Mar 25, 2026
Last Modified: Aug 10, 2026

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