CVE-2026-39419: CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') in 1Panel-dev MaxKB
CVE-2026-39419 is a vulnerability in MaxKB versions 2. 7. 1 and below that allows an authenticated user to bypass sandbox result validation and spoof tool execution results. The attacker exploits Python frame introspection to read a wrapper's UUID from bytecode constants and writes a forged result directly to file descriptor 1, bypassing stdout redirection. By calling sys. exit(0), the attacker terminates the wrapper before legitimate output is printed, causing MaxKB to parse and trust the spoofed response. This issue is fixed in version 2. 8. 0.
AI Analysis
Technical Summary
MaxKB, an open-source AI assistant for enterprise, in versions prior to 2.8.0, contains a vulnerability where an authenticated user can manipulate the tool execution results by exploiting Python frame introspection to obtain the wrapper's UUID and write forged output directly to file descriptor 1. This bypasses the intended sandbox validation and stdout redirection mechanisms. The attacker then terminates the wrapper process prematurely using sys.exit(0), preventing legitimate output from being printed and causing the MaxKB service to accept the spoofed result as genuine. This vulnerability is classified under CWE-74 (Improper Neutralization of Special Elements in Output), CWE-693, and CWE-290. The CVSS v3.1 base score is 3.1, indicating low severity.
Potential Impact
The vulnerability allows an authenticated user to spoof tool execution results within MaxKB by bypassing sandbox validation and output redirection. This could lead to the MaxKB service trusting forged responses, potentially impacting the integrity of the tool's output. There is no impact on confidentiality or availability reported. No known exploits in the wild have been identified. The overall impact is limited to integrity with low severity.
Mitigation Recommendations
This vulnerability has been fixed in MaxKB version 2.8.0. Users should upgrade to version 2.8.0 or later to remediate this issue. Since the product is not a cloud service and no official patch link is provided, upgrading to the fixed version is the recommended remediation. Patch status is confirmed by the vendor's versioning information.
CVE-2026-39419: CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') in 1Panel-dev MaxKB
Description
CVE-2026-39419 is a vulnerability in MaxKB versions 2. 7. 1 and below that allows an authenticated user to bypass sandbox result validation and spoof tool execution results. The attacker exploits Python frame introspection to read a wrapper's UUID from bytecode constants and writes a forged result directly to file descriptor 1, bypassing stdout redirection. By calling sys. exit(0), the attacker terminates the wrapper before legitimate output is printed, causing MaxKB to parse and trust the spoofed response. This issue is fixed in version 2. 8. 0.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
MaxKB, an open-source AI assistant for enterprise, in versions prior to 2.8.0, contains a vulnerability where an authenticated user can manipulate the tool execution results by exploiting Python frame introspection to obtain the wrapper's UUID and write forged output directly to file descriptor 1. This bypasses the intended sandbox validation and stdout redirection mechanisms. The attacker then terminates the wrapper process prematurely using sys.exit(0), preventing legitimate output from being printed and causing the MaxKB service to accept the spoofed result as genuine. This vulnerability is classified under CWE-74 (Improper Neutralization of Special Elements in Output), CWE-693, and CWE-290. The CVSS v3.1 base score is 3.1, indicating low severity.
Potential Impact
The vulnerability allows an authenticated user to spoof tool execution results within MaxKB by bypassing sandbox validation and output redirection. This could lead to the MaxKB service trusting forged responses, potentially impacting the integrity of the tool's output. There is no impact on confidentiality or availability reported. No known exploits in the wild have been identified. The overall impact is limited to integrity with low severity.
Mitigation Recommendations
This vulnerability has been fixed in MaxKB version 2.8.0. Users should upgrade to version 2.8.0 or later to remediate this issue. Since the product is not a cloud service and no official patch link is provided, upgrading to the fixed version is the recommended remediation. Patch status is confirmed by the vendor's versioning information.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-07T00:23:30.595Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69dd9c8b82d89c981fa11923
Added to database: 4/14/2026, 1:46:51 AM
Last enriched: 4/14/2026, 2:02:13 AM
Last updated: 4/14/2026, 8:12:14 AM
Views: 11
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.