Integer overflow in Linuxfoundation Nats-server
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 i…
Vulnerability class: Integer Overflow
EPSS: 0.006 (44.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Linuxfoundation Nats-server
- Nats-io Nats-server — versions >= 2.2.0, < 2.11.14, >= 2.12.0, < 2.12.5
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Mitigation, Vendor Advisory)
- security-advisories@github.com (x_refsource_MISC, Mitigation, Vendor Advisory)
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
- 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Frequently asked questions
- What is CVE-2026-27889?
- CVE-2026-27889 is a high-severity vulnerability in Linuxfoundation Nats-server, classified under Integer Overflow or Wraparound. CVSS score: 7.5/10. Published 2026-03-25.
- How severe is CVE-2026-27889?
- High severity. CVSS v3 base score is 7.5 out of 10.