NULL pointer dereference in Linuxfoundation 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 server during the pre-authentication leafnode handshake by sending repeated leafnode INFO protocol messages before authentication and account setup completed. This issue is fixed in versions 2.12.8 and 2.11.17.
EPSS: 0.005 (41.2th 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 < 2.11.17, >= 2.12.0-preview.1, < 2.12.8
Weakness classification (CWE)
References
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC, Release Notes)
- security-advisories@github.com (x_refsource_MISC, Release Notes)
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-58250?
- CVE-2026-58250 is a high-severity vulnerability in Linuxfoundation 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.