CVEvulnerability

CVE-2026-27889

7.5 HIGH Published 2026-03-25 Modified 2026-09-09 Official page ↗
Status
Modified
Published
2026-03-25
Last modified
2026-09-09
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 3.1 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses
CWE-1286, CWE-190

Description

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in version 2.2.0 and prior to versions 2.11.14 and 2.12.5, a missing sanity check on a WebSockets frame could trigger a server panic in the nats-server. This happens before authentication, and so is exposed to anyone who can connect to the websockets port. Versions 2.11.14 and 2.12.5 contains a fix. A workaround is available. The vulnerability only affects deployments which use WebSockets and which expose the network port to untrusted end-points. If one is able to do so, a defense in depth of restricting either of these will mitigate the attack.

Affected configurations

• linuxfoundation nats-server (>= 2.2.0 < 2.11.14) • linuxfoundation nats-server (>= 2.12.0 < 2.12.5)

Related

Weakness · CWE (2)

  • CWE-1286 Improper Validation of Syntactic Correctness of Input weakness
  • CWE-190 Integer Overflow or Wraparound weakness

References