NULL pointer dereference in Nats-io Nats-server

CVE-2026-58250

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 serv…

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

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-58250?
CVE-2026-58250 is a high-severity vulnerability in Nats-io Nats-server, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2026-07-08.
How severe is CVE-2026-58250?
High severity. CVSS v3 base score is 7.5 out of 10.