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

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Summary

CVECVE-2026-58250
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-08 20:16:54 UTC
Updated2026-07-08 20:16:54 UTC
DescriptionNATS 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-476 | CWE-476 CWE-476: NULL Pointer Dereference

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Nats-io Nats-server affected < 2.11.17 Not specified
CNA Nats-io Nats-server affected >= 2.12.0-preview.1, < 2.12.8 Not specified

References

ReferenceSourceLinkTags
github.com/nats-io/nats-server/releases/tag/v2.11.17 [email protected] github.com
github.com/nats-io/nats-server/releases/tag/v2.12.8 [email protected] github.com
github.com/nats-io/nats-server/commit/8dcb26eaea78fdcbe96dbee5986d6019fd... [email protected] github.com
github.com/nats-io/nats-server/commit/fc5fe39177533e9dbdd651d2458285bfae... [email protected] github.com
github.com/nats-io/nats-server/security/advisories/GHSA-3g5q-cfh2-cq67 [email protected] github.com
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