by Kastro
Paper/Archive/CVE-2026-110616

CVE-2026-110616

nullclaw NullHub — NullHub through 2026.5.29 Missing Authentication for /api Management API

EPSS 1.0%public exploitCVSS 9.2
critical.is priorityof 100
50
CVSS 9.2 (CNA)9.2 / 10 × 3027.6Not in CISA KEV+300.0EPSS percentile 61.2.612 × 2012.2Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
NullHub≤ 2026.5.29–CNA

Scores by source

VulnCheck (CNA)9.2CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
VulnCheck (CNA)8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: poc · Automatable: no · Technical impact: total

References

exploithackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/rJrLma3izgwriteupgithub.com/nullclaw/nullhub/blob/v2026.5.29/src/server.zig#L546-L556writeupgithub.com/nullclaw/nullhub/blob/v2026.5.29/src/api/settings.zig#L29-L54writeupgithub.com/nullclaw/nullhub/blob/v2026.5.29/Dockerfile#L69-L71refgithub.com/nullclaw/nullhubwriteupvulncheck.com/advisories/nullhub-through-2026.5.29-missing-authentication-for-api-management-api