CVE-2026-42336 MaxKB: SSRF Bypass via DNS Rebinding in MaxKB OSS URL Fetch
Attackers can bypass SSRF protections via DNS rebinding to access internal network services in MaxKB OSS URL fetch functionality.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-42336?
CVE-2026-42336 is a medium-severity server-side request forgery vulnerability in 1Panel-dev MaxKB, published on 26 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
MaxKB is an open-source AI assistant for enterprise. MaxKB 2.8.0 and prior are vulnerable to a server-side request forgery (SSRF) bypass in the OSS file service URL fetch functionality due to inconsistent DNS resolution between validation and actual request execution, allowing attackers to access internal network services. This vulnerability is fixed in 2.8.1.
Which versions are affected by CVE-2026-42336?
How do I fix CVE-2026-42336?
No fix has been published for CVE-2026-42336 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-42336 being exploited?
There is no known exploitation of CVE-2026-42336 in the wild and no public exploit code.
Sources
Also known as GHSA-6m4p-9wwc-4q5q.