CVE-2026-39419

LOW EPSS 12.7%
Published Apr 14, 20262mo ago · Modified Jun 17, 20261w ago
3.1 CVSS 3.1
Low
Find Similar
Published Apr 14, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago

Description

MaxKB is an open-source AI assistant for enterprise. In versions 2.7.1 and below, an authenticated user can bypass sandbox result validation and spoof tool execution results by exploiting Python frame introspection to read the wrapper's UUID from its bytecode constants, then writing a forged result directly to file descriptor 1 (bypassing stdout redirection). By calling sys.exit(0), the attacker terminates the wrapper before it prints the legitimate output, causing the MaxKB service to parse and trust the spoofed response as the genuine tool result. This issue has been fixed in version 2.8.0.

CVSS Details

Base Score
3.1
Exploitability
1.6
Impact
1.4
Vector string
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
Attack Vector Network
Attack Complexity High
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity Low
Availability None

Threat Intelligence

EPSS Exploit Probability
12.7% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 3

CWE-290
CWE-693
CWE-74

Affected Products 1

VendorProductVersionRange
maxkbmaxkb* <2.8.0

References 3

  • github.com https://github.com/1Panel-dev/MaxKB/commit/38c4cfecd065293ede0437f6fa76cf0116591d25
    Patch
  • github.com https://github.com/1Panel-dev/MaxKB/releases/tag/v2.8.0
    Release Notes
  • github.com https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-f3c8-p474-xwfv
    Vendor Advisory

Remediation

  • github.com https://github.com/1Panel-dev/MaxKB/commit/38c4cfecd065293ede0437f6fa76cf0116591d25
    Patch