CVE-2026-42336 PUBLISHED

MaxKB: SSRF Bypass via DNS Rebinding in MaxKB OSS URL Fetch

Assigner: GitHub_M
Reserved: 26.04.2026 Published: 26.05.2026 Updated: 26.05.2026

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.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N
CVSS Score: 5.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	High
Attack Complexity	High	Integrity	None	Integrity	Low
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

Product Status

Vendor	1Panel-dev
Product	MaxKB
Versions	Version < 2.8.1 is affected

References

https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-6m4p-9wwc-4q5q

Problem Types

CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition CWE
CWE-918: Server-Side Request Forgery (SSRF) CWE