CVE-2026-33249 is a medium-severity vulnerability affecting NATS-Server versions 2.11.0 through 2.11.14 and 2.12.0 through 2.12.5, allowing a valid client to redirect message tracing headers to any valid subject, even without publish permissions. Rated 4.3 CVSSv3.1, this flaw has a network attack vector and low complexity, requiring low privileges, and results in a low integrity impact by enabling unauthorized message redirection. There is no evidence of active exploitation, nor are public exploit codes available, and community discussion is minimal. Organizations should upgrade to NATS-Server 2.11.15 or 2.12.6 to mitigate this vulnerability.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 2.11.0, < 2.11.15CPE matchmatch criteria | cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:* | ||
>= 2.12.0, < 2.12.6CPE matchmatch criteria | cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.
The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.