Nixpkgs security tracker
Untriaged
Permalink
CVE-2026-29785
7.5 HIGH
- CVSS version: 3.1
- Attack vector (AV): NETWORK
- Attack complexity (AC): LOW
- Privileges required (PR): NONE
- User interaction (UI): NONE
- Scope (S): UNCHANGED
- Confidentiality impact (C): NONE
- Integrity impact (I): NONE
- Availability impact (A): HIGH
NATS Server panic via malicious compression on leafnode port
NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.14 and 2.12.5, if the nats-server has the "leafnode" configuration enabled (not default), then anyone who can connect can crash the nats-server by triggering a panic. This happens pre-authentication and requires that compression be enabled (which it is, by default, when leafnodes are used). Versions 2.11.14 and 2.12.5 contain a fix. As a workaround, disable compression on the leafnode port.
References
-
https://github.com/nats-io/nats-server/security/advisories/GHSA-52jh-2xxh-pwh6 x_refsource_CONFIRM
-
https://advisories.nats.io/CVE/secnote-2026-04.txt x_refsource_MISC
Affected products
nats-server
- ==< 2.11.14
- ==>= 2.12.0-RC.1, < 2.12.5
Package maintainers
-
@derekcollison Derek Collison <derek@nats.io>
-
@swdunlop Scott W. Dunlop <swdunlop@gmail.com>