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THREAT OPS › Threat News › [NVD] CVE-2026-33219 (MEDIUM 5.3) — NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, a malicious client which can connect to the WebSockets port can cause unbounded memory use in the nats-server before authentication; this requires

[NVD] CVE-2026-33219 (MEDIUM 5.3) — NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, a malicious client which can connect to the WebSockets port can cause unbounded memory use in the nats-server before authentication; this requires

lownvdPublished 2026-03-25

CVE-2026-33219 CVSS: 5.3 MEDIUM Published: 2026-03-25T20:16:32.777

NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, a malicious client which can connect to the WebSockets port can cause unbounded memory use in the nats-server before authentication; this requires sending a corresponding amount of data. This is a m

MITRE ATT&CK techniques

CompressionT1027.015

Indicators of compromise

CVE-2026-33219cve
CVE-2026-27571cve
nats.iodomain

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-33219