CVE-2026-39418 (GCVE-0-2026-39418)
Vulnerability from cvelistv5
Published
2026-04-14 00:08
Modified
2026-04-14 15:54
CWE
  • CWE-918 - Server-Side Request Forgery (SSRF)
Summary
MaxKB is an open-source AI assistant for enterprise. In versions 2.7.1 and below, sandbox network protection can be bypassed by using socket.sendto() with the MSG_FASTOPEN flag. This allows authenticated user with tool-editing permissions to reach internal services that are explicitly blocked by the sandbox's banned hosts configuration. MaxKB's sandbox uses LD_PRELOAD to hook the connect() function and block connections to banned IPs, but Linux's sendto() with the MSG_FASTOPEN flag can establish TCP connections directly through the kernel without ever calling connect(), completely bypassing the IP validation. Although sendto is listed in the syscall() wrapper, this is ineffective because glibc invokes the kernel syscall directly rather than routing through the hooked syscall() function. This issue has been fixed in version 2.8.0.
Impacted products
Vendor Product Version
1Panel-dev MaxKB Version: < 2.8.0
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Show details on NVD website


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