CVE-2026-79918: MaxKB: Sandbox escape via unhooked fexecve

Severity: medium (CVSS 6.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-21 · updated 2026-09-24
Weakness: CWE-693

Description

MaxKB is an open-source AI assistant for enterprise. Prior to version 2.10.6-lts, the ToolExecutor LD_PRELOAD sandbox hooks execve, execvpe, and execveat to prevent subprocess creation but does not hook fexecve. An authenticated attacker able to execute tool code can call fexecve to start a process outside the sandbox's intended subprocess policy. This issue is fixed in version 2.10.6-lts.

Affected products

1Panel-dev MaxKB: before 2.10.6-lts

References

https://github.com/1Panel-dev/MaxKB/commit/6fa7947a85030b87977c4026f33af11ca10dd1e6
https://github.com/1Panel-dev/MaxKB/releases/tag/v2.10.6-lts
https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-9mh9-v949-fwqh

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