Vulnerability DatabaseCVE-2026-29785
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CVE-2026-29785
March 25, 2026
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.
Affected Packages
https://github.com/nats-io/nats-server.git (GITHUB):
Affected version(s) >=v0.5.1 <v2.11.14
Fix Suggestion:
Update to version v2.11.14
https://github.com/nats-io/nats-server.git (GITHUB):
Affected version(s) >=v2.12.0 <v2.12.5
Fix Suggestion:
Update to version v2.12.5
https://github.com/nats-io/nats-server.git (GITHUB):
Affected version(s) >=v2.12.0 <v2.12.5
Fix Suggestion:
Update to version v2.12.5
https://github.com/nats-io/nats-server.git (GITHUB):
Affected version(s) >=v2.12.0 <v2.12.5
Fix Suggestion:
Update to version v2.12.5
https://github.com/nats-io/nats-server.git (GITHUB):
Affected version(s) >=v0.5.1 <v2.11.14
Fix Suggestion:
Update to version v2.11.14
https://github.com/nats-io/nats-server.git (GITHUB):
Affected version(s) >=v2.12.0 <v2.12.5
Fix Suggestion:
Update to version v2.12.5
https://github.com/nats-io/nats-server.git (GITHUB):
Affected version(s) >=v0.5.1 <v2.11.14
Fix Suggestion:
Update to version v2.11.14
github.com/nats-io/nats-server/v2 (GO):
Affected version(s) >=v2.0.0-RC14.0.20190604014547-ed1901c79292 <2.12.5
Fix Suggestion:
Update to version 2.12.5
github.com/nats-io/nats-server/v2 (GO):
Affected version(s) >=v2.0.0-RC14.0.20190604014547-ed1901c79292 <2.12.5
Fix Suggestion:
Update to version 2.12.5
github.com/nats-io/nats-server/v2 (GO):
Affected version(s) >=v2.0.0-RC14.0.20190604014547-ed1901c79292 <2.12.5
Fix Suggestion:
Update to version 2.12.5
github.com/nats-io/nats-server/v2 (GO):
Affected version(s) >=v2.0.0-RC14.0.20190604014547-ed1901c79292 <2.12.5
Fix Suggestion:
Update to version 2.12.5
github.com/nats-io/nats-server/v2 (GO):
Affected version(s) >=v2.0.0-RC14.0.20190604014547-ed1901c79292 <2.12.5
Fix Suggestion:
Update to version 2.12.5
github.com/nats-io/nats-server/v2 (GO):
Affected version(s) >=v2.0.0-RC14.0.20190604014547-ed1901c79292 <2.12.5
Fix Suggestion:
Update to version 2.12.5
Related Resources (5)
https://nvd.nist.gov/vuln/detail/CVE-2026-29785
https://github.com/nats-io/nats-server/security/advisories/GHSA-52jh-2xxh-pwh6
https://github.com/nats-io/nats-server
https://github.com/nats-io/nats-server/commit/a1488de6f2ba6e666aef0f9cce0016f7f167d6a8
https://advisories.nats.io/CVE/secnote-2026-04.txt
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CVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
NULL Pointer Dereference
CWE-476
EPSS
Base Score:
0.09