---
title: "CVE-2026-110616: NullHub - Authentication Bypass"
description: "NullHub through 2026.5.29 contains a broken authentication vulnerability caused by the auth_token field defaulting to null and never being assigned in /api/* management API, letting unauthenticated attackers control agent instances and configurations, exploit requires sending requests without Authorization or Origin headers to non-loopback listeners."
url: https://panop.io/threat-heartbeat/CVE-2026-110616/
---

# CVE-2026-110616 NullHub - Authentication Bypass

NullHub through 2026.5.29 contains a broken authentication vulnerability caused by the auth\_token field defaulting to null and never being assigned in /api/\* management API, letting unauthenticated attackers control agent instances and configurations, exploit requires sending requests without Authorization or Origin headers to non-loopback listeners.

CVSS base score 8.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-110616)

## Details

Type

Authentication Bypass

Impact

Broken Access Control

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Published

14 October 2026

Updated

15 October 2026

Weakness

[CWE-306](https://cwe.mitre.org/data/definitions/306.html)

## Vendor fix

Update to a version later than 2026.5.29 or apply patches that enforce proper authentication.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-110616](https://nvd.nist.gov/vuln/detail/CVE-2026-110616)
- [https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/rJrLma3izg](https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/rJrLma3izg)
- [https://www.vulncheck.com/advisories/nullhub-through-2026.5.29-missing-authentication-for-api-management-api](https://www.vulncheck.com/advisories/nullhub-through-2026.5.29-missing-authentication-for-api-management-api)
- [https://github.com/nullclaw/nullhub](https://github.com/nullclaw/nullhub)
- [https://github.com/nullclaw/nullhub/blob/v2026.5.29/Dockerfile#L69-L71](https://github.com/nullclaw/nullhub/blob/v2026.5.29/Dockerfile#L69-L71)
- [https://github.com/nullclaw/nullhub/blob/v2026.5.29/src/api/settings.zig#L29-L54](https://github.com/nullclaw/nullhub/blob/v2026.5.29/src/api/settings.zig#L29-L54)
- [https://github.com/nullclaw/nullhub/blob/v2026.5.29/src/server.zig#L546-L556](https://github.com/nullclaw/nullhub/blob/v2026.5.29/src/server.zig#L546-L556)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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