CVE-2026-33249 — Incorrect Authorization in Nats-io Nats-server V2
Severity
4.3MEDIUMNVD
EPSS
0.0%
top 92.51%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedMar 25
Latest updateMar 26
Description
NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Starting in version 2.11.0 and prior to versions 2.11.15 and 2.12.6, a valid client which uses message tracing headers can indicate that the trace messages can be sent to an arbitrary valid subject, including those to which the client does not have publish permission. The payload is a valid trace message and not chosen by the attacker. Versions 2.11.15 and 2.12.6 contain a fix. No known workarounds ar…
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:NExploitability: 2.8 | Impact: 1.4
Affected Packages5 packages
🔴Vulnerability Details
4OSV▶
NATS: Message tracing can be redirected to arbitrary subject in github.com/nats-io/nats-server↗2026-03-26