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CVE-2026-29785

NATS Server panic via malicious compression on leafnode port

Published: Mar 25, 2026Updated: Mar 26, 2026 Sources: CVE List NVDCWE-476
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.4%
Top 69.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-476

Affected Products

nats-servernats-io
On-prem
Databases / cache-message-queue
nats-serverlinuxfoundation
Mixed
AI / ML / ml-framework
nats-iooss-projectDatabases
linuxfoundationoss-projectUSAI / MLaka yocto, pytorch, everest

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available
Workaround Available

MITRE ATT&CK

2 techniques
Impact
Initial Access
View detailed technique mapping

References

https://github.com/nats-io/nats-server/security/advisories/GHSA-52jh-2xxh-pwh6
github.com
https://github.com/nats-io/nats-server/commit/a1488de6f2ba6e666aef0f9cce0016f7f167d6a8
github.com
https://advisories.nats.io/CVE/secnote-2026-04.txt
advisories.nats.io

Timeline

Published
Mar 25, 2026
Last Updated
Mar 26, 2026

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