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CVE-2026-58250

NATS Server: Pre-auth server crash via double INFO in leafnode handshake PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
nats-io / nats-serveraffected < 2.11.17; affected >= 2.12.0-preview.1, < 2.12.8

CWE

CWE-476

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.