GHSA-55h8-8g96-x4hj

Source

https://github.com/advisories/GHSA-55h8-8g96-x4hj

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-55h8-8g96-x4hj/GHSA-55h8-8g96-x4hj.json

JSON Data

https://api.test.osv.dev/v1/vulns/GHSA-55h8-8g96-x4hj

Aliases

Downstream

CGA (58)

MINI (7)

Published

2026-03-24T21:50:25Z

Modified

2026-07-17T21:04:21Z

Severity

6.4 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N CVSS Calculator

Summary

NATS: Leafnode connections allow spoofing of Nats-Request-Info identity headers

Details

Background

NATS.io is a high performance open source pub-sub distributed communication technology, built for the cloud, on-premise, IoT, and edge computing.

The nats-server allows hub/spoke topologies using "leafnode" connections by other nats-servers. NATS messages can have headers.

Problem Description

The nats-server offers a Nats-Request-Info: message header, providing information about a request. This is supposed to provide enough information to allow for account/user identification, such that NATS clients could make their own decisions on how to trust a message, provided that they trust the nats-server as a broker.

A leafnode connecting to a nats-server is not fully trusted unless the system account is bridged too. Thus identity claims should not have propagated unchecked.

Thus NATS clients relying upon the Nats-Request-Info: header could be spoofed.

Does not directly affect the nats-server itself, but the CVSS Confidentiality and Integrity scores are based upon what a hypothetical client might choose to do with this NATS header.

Affected Versions

Any version before v2.12.6 or v2.11.15

Workarounds

None.

Database specific

{
    "cwe_ids":  [
        "CWE-287",
        "CWE-290"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-03-24T21:50:25Z",
    "nvd_published_at":  "2026-03-25T20:16:33Z",
    "severity":  "MODERATE"
}

References

Affected packages

Go / github.com/nats-io/nats-server/v2

Package

Name: github.com/nats-io/nats-server/v2; View open source insights on deps.dev
Purl: pkg:golang/github.com/nats-io/nats-server/v2

Affected ranges

Type: SEMVER
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

2.11.15

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-55h8-8g96-x4hj/GHSA-55h8-8g96-x4hj.json"

Go / github.com/nats-io/nats-server/v2

Package

Name: github.com/nats-io/nats-server/v2; View open source insights on deps.dev
Purl: pkg:golang/github.com/nats-io/nats-server/v2

Affected ranges

Type: SEMVER
Events: Introduced

2.12.0-RC.1

Fixed

2.12.6

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-55h8-8g96-x4hj/GHSA-55h8-8g96-x4hj.json"

Go / github.com/nats-io/nats-server

Package

Name: github.com/nats-io/nats-server; View open source insights on deps.dev
Purl: pkg:golang/github.com/nats-io/nats-server

Affected ranges

Type: SEMVER
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-55h8-8g96-x4hj/GHSA-55h8-8g96-x4hj.json"