CVE-2026-27889General(linuxfoundation / nats-server)

LOWCVSS 7.5 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD 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.

0.0/ 10 priority

Sources & remediation

Weakness type (CWE)
CWE-190CWE-1286

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • nats-server

Threat summary

  • 1 mentions across 1 observed day

What's happening

  • General: 1 classified signal
  • 1 total mentions across 1 day

Affected systems

Products
nats-server

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-03-25: 103-25
Signal classification1 categories
General
1100.0%
Referenced assets2 URLs
By indicator
Full discourse1 post
  • CVE@CVEnew
    General

    CVE-2026-27889 NATS-Server is a High-Performance server for http://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 … https://www.cve.org/CVERecord?id=CVE-2026-27889

    Post summary

    The post references CVE‑2026‑27889 and a link to the CVE record but provides no further technical, exploit, or mitigation details.

    00000114
    56.8K followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Applinuxfoundationnats-server---

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