High severity · published Oct 14, 2026
CVE-2026-110616
NullHub through 2026.5.29 Missing Authentication for /api Management API
8.1
CVSS
1%
EPSS
No
On KEV
Description
NullHub through 2026.5.29 contains a missing authentication vulnerability that allows unauthenticated attackers to access the /api/* management API because the auth_token field defaults to null and is never assigned. Attackers sending requests without Authorization or Origin headers to non-loopback listeners can control agent instances, rewrite configurations including provider credentials, and manage cron jobs and MCP servers.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.0% · higher than 61% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NU
NullHub · nullclaw
through 2026.5.29 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-110616
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-110616
third-party-advisory
https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/rJrLma3izg
technical-description
https://github.com/nullclaw/nullhub/blob/v2026.5.29/src/server.zig#L546-L556
technical-description
https://github.com/nullclaw/nullhub/blob/v2026.5.29/src/api/settings.zig#L29-L54
technical-description
https://github.com/nullclaw/nullhub/blob/v2026.5.29/Dockerfile#L69-L71
product
https://github.com/nullclaw/nullhub
third-party-advisory
https://www.vulncheck.com/advisories/nullhub-through-2026.5.29-missing-authentication-for-api-management-api