CVE-2026-58250NATS Server: Pre-auth server crash via double INFO in leafnode handshake

Descripción

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.

Datos: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Se publican tal como los indican las fuentes, en inglés.

Productos y versiones afectados

Referencias y parches

• https://github.com/nats-io/nats-server/security/advisories/GHSA-3g5q-cfh2-cq67 Vendor Advisory
• https://github.com/nats-io/nats-server/commit/8dcb26eaea78fdcbe96dbee5986d6019fd5cb94a Patch
• https://github.com/nats-io/nats-server/commit/fc5fe39177533e9dbdd651d2458285bfae1dde27 Patch
• https://github.com/nats-io/nats-server/releases/tag/v2.11.17 Release Notes
• https://github.com/nats-io/nats-server/releases/tag/v2.12.8 Release Notes