CVE-2026-58250 | THREATINT

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.

PUBLISHED Reserved 2026-06-29 | Published 2026-07-08 | Updated 2026-07-09 | Assigner GitHub_M

HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem types

CWE-476: NULL Pointer Dereference

Product status

< 2.11.17

affected

>= 2.12.0-preview.1, < 2.12.8

affected

References

github.com/...server/security/advisories/GHSA-3g5q-cfh2-cq67

github.com/...ommit/8dcb26eaea78fdcbe96dbee5986d6019fd5cb94a

github.com/...ommit/fc5fe39177533e9dbdd651d2458285bfae1dde27

github.com/nats-io/nats-server/releases/tag/v2.11.17

github.com/nats-io/nats-server/releases/tag/v2.12.8

cve.org (CVE-2026-58250)

nvd.nist.gov (CVE-2026-58250)

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