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CVE-2026-58250

NATS Server: Pre-auth server crash via double INFO in leafnode handshake

Published: Jul 8, 2026Updated: Jul 13, 2026 Sources: CVE List NVDCWE-476
7.5HIGH
NVD MITRE
EPSS Score
0.5%
Top 59.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

Description

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.12.8 and 2.11.17, an unauthenticated peer with network access to a leafnode listener with compression enabled could crash the server during the pre-authentication leafnode handshake by sending repeated leafnode INFO protocol messages before authentication and account setup completed. This issue is fixed in versions 2.12.8 and 2.11.17.

No summary for this CVE yet.

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

linuxfoundation
oss-project·USaka yocto, everest, pytorch
nats-serverOn-premDatabase
AI / ML / vector-db-rag
nats-io
oss-project
nats-serverOn-prem
Databases / cache-message-queue

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Impact
Initial Access
View detailed technique mapping

References

https://github.com/nats-io/nats-server/commit/8dcb26eaea78fdcbe96dbee5986d6019fd5cb94a
github.com
https://github.com/nats-io/nats-server/commit/fc5fe39177533e9dbdd651d2458285bfae1dde27
github.com
https://github.com/nats-io/nats-server/releases/tag/v2.11.17
github.com
and 2 more references View all →

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