CVE detail
CVE-2026-27889
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.
Buzz score
Why this CVE is surfacing
This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.
Buzz score components · mention 22.0 · diversity 14.5 · KEV 0.0 · OTX 0.0 · PoC 0.0
Why it matters now
Mention timeline
- Total mentions
- 0
- within the 30d window
- Peak daily
- 0
- highest bucket
Evidence
Source links by recency
8 source links · newest first
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27889.jsonsecurity.access.redhat.com
No excerpt available.
Vendor Advisorysecurity.access.redhat.comMar 25, 2026, 8:16 PM - https://bugzilla.redhat.com/show_bug.cgi?id=2451447bugzilla.redhat.com
No excerpt available.
Exploitbugzilla.redhat.comMar 25, 2026, 8:16 PM - https://access.redhat.com/security/cve/CVE-2026-27889access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comMar 25, 2026, 8:16 PM - https://access.redhat.com/errata/RHSA-2026:23345access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comMar 25, 2026, 8:16 PM - https://access.redhat.com/errata/RHSA-2026:22347access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comMar 25, 2026, 8:16 PM - https://access.redhat.com/errata/RHSA-2026:21769access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comMar 25, 2026, 8:16 PM No excerpt available.
Exploitgithub.comMar 25, 2026, 8:16 PM- https://advisories.nats.io/CVE/secnote-2026-03.txtadvisories.nats.io
No excerpt available.
Vendor Advisoryadvisories.nats.ioMar 25, 2026, 8:16 PM
Exploit code
Public exploit repository references
Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.
0 repository references · best confidence N/A · max 0 stars
Related records
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- CVE-2026-64765CVSS 7.8 · High
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