PT-2026-56561 · Nats.Io · Nats Server

Published 2026-07-08 · Updated 2026-07-08 · CVE-2026-58213

NVD

CVSS v3.1

7.1

High

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

NATS Server is a high-performance server for NATS.io, the cloud and edge native messaging system. Prior to 2.14.1 and 2.12.9, an MQTT client could include protocol control characters in subscription filters that were later forwarded as NATS protocol data to route or leafnode connections, corrupting the forwarded protocol stream and allowing injection of unintended NATS protocol operations. This issue is fixed in versions 2.14.1 and 2.12.9.

Fix

Special Elements Injection

Weakness Enumeration

CWE-74

Related Identifiers

CVE-2026-58213

Affected Products

Nats Server

References · 9

• https://nvd.nist.gov/vuln/detail/CVE-2026-58213 · Security Note
• https://github.com/nats-io/nats-server/releases/tag/v2.12.9 · Note
• https://github.com/nats-io/nats-server/security/advisories/GHSA-qrcv-3558-gj4f · Note
• https://github.com/nats-io/nats-server/pull/8163 · Note
• https://github.com/nats-io/nats-server/releases/tag/v2.14.1 · Note
• https://github.com/nats-io/nats-server/pull/8164 · Note
• https://github.com/nats-io/nats-server/commit/366837cfc65ab9ccb4f98193c65e8daf238582d8 · Note
• https://github.com/nats-io/nats-server/commit/64ebae40051ee497c481e10f316238faf0de1736 · Note
• https://github.com/nats-io/nats-server/commit/f14856b9e57a36818f43851cb69b6e33670885c9 · Note