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 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 the service to trust the spoofed response. This issue is fixed in version 2. 8. 0.
AI Analysis
Technical Summary
MaxKB, an open-source AI assistant, has a vulnerability (CVE-2026-39419) in versions prior to 2.8.0 where an authenticated user can bypass sandbox validation by exploiting Python frame introspection to obtain the wrapper's UUID from bytecode constants. The attacker then writes a forged tool execution result directly to file descriptor 1, circumventing stdout redirection. By invoking sys.exit(0), the wrapper terminates before printing legitimate output, leading MaxKB to parse and trust the spoofed response as genuine. This improper neutralization of special elements in output is classified under CWE-74 and related CWEs. The vulnerability has a CVSS 3.1 score of 3.1 (low severity) and has been fixed in version 2.8.0.
Potential Impact
The vulnerability allows an authenticated user to spoof tool execution results by bypassing sandbox validation, potentially causing MaxKB to process and trust forged responses. The impact is limited to integrity (low impact) with no confidentiality or availability effects reported. There are no known exploits in the wild.
Mitigation Recommendations
Upgrade MaxKB to version 2.8.0 or later, where this vulnerability has been fixed. Since the vendor has released a fixed version, applying this update is the recommended remediation. No other mitigation guidance is provided or necessary.
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 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 the service to trust the spoofed response. This issue is fixed in version 2. 8. 0.
CVSS v3.1
Score 3.1low
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
MaxKB, an open-source AI assistant, has a vulnerability (CVE-2026-39419) in versions prior to 2.8.0 where an authenticated user can bypass sandbox validation by exploiting Python frame introspection to obtain the wrapper's UUID from bytecode constants. The attacker then writes a forged tool execution result directly to file descriptor 1, circumventing stdout redirection. By invoking sys.exit(0), the wrapper terminates before printing legitimate output, leading MaxKB to parse and trust the spoofed response as genuine. This improper neutralization of special elements in output is classified under CWE-74 and related CWEs. The vulnerability has a CVSS 3.1 score of 3.1 (low severity) and has been fixed in version 2.8.0.
Potential Impact
The vulnerability allows an authenticated user to spoof tool execution results by bypassing sandbox validation, potentially causing MaxKB to process and trust forged responses. The impact is limited to integrity (low impact) with no confidentiality or availability effects reported. There are no known exploits in the wild.
Mitigation Recommendations
Upgrade MaxKB to version 2.8.0 or later, where this vulnerability has been fixed. Since the vendor has released a fixed version, applying this update is the recommended remediation. No other mitigation guidance is provided or necessary.
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: 4/21/2026, 6:26:57 AM
Last updated: 5/29/2026, 1:07:57 AM
Views: 74
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