NATS Server: Pre-auth server crash via double INFO in leafnode handshake
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.
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-58250US | — | — | ||
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 leaf… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/nats-io/nats-server/commit/8dcb26eaea78fdcbe96dbee5986d6019fd5cb94aFIX
- https://github.com/nats-io/nats-server/commit/fc5fe39177533e9dbdd651d2458285bfae1dde27FIX
- https://github.com/nats-io/nats-server/releases/tag/v2.11.17ARTICLE
- https://github.com/nats-io/nats-server/releases/tag/v2.12.8ARTICLE
- https://github.com/nats-io/nats-server/security/advisories/GHSA-3g5q-cfh2-cq67ADVISORY
- https://nvd.nist.gov/vuln/detail/CVE-2026-58250WEB
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