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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.007 (53.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
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
- github.com/nats-io/nats-server/commit/8dcb26eaea78fdcbe96dbee5986d6019fd5cb94a (Patch)
- github.com/nats-io/nats-server/commit/fc5fe39177533e9dbdd651d2458285bfae1dde27 (Patch)
- github.com/nats-io/nats-server/releases/tag/v2.11.17 (Release Notes)
- github.com/nats-io/nats-server/releases/tag/v2.12.8 (Release Notes)
- github.com/nats-io/nats-server/security/advisories/GHSA-3g5q-cfh2-cq67 (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.