CVE-2026-39042: n/a
A denial of service vulnerability exists in MikroTik RouterOS versions 7.21.x before 7.21.4 and 7.22.x before 7.22.2. The issue is triggered remotely via the unflatten() function in the libumsg.so library, allowing an attacker to disrupt service.
AI Analysis
Technical Summary
CVE-2026-39042 is a denial of service vulnerability in MikroTik RouterOS affecting versions 7.21.x prior to 7.21.4 and 7.22.x prior to 7.22.2. The flaw is located in the unflatten() function within the libumsg.so component, which can be exploited remotely to cause the system to become unavailable. No CVSS score or detailed exploit information is provided, and no vendor advisory or patch links are included in the data.
Potential Impact
Successful exploitation results in denial of service, causing affected MikroTik RouterOS devices to become unresponsive or crash. This disrupts network operations relying on these devices. There is no indication of code execution or data compromise from the provided information.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since affected versions are explicitly stated, users should verify if their RouterOS installations fall within these versions and monitor MikroTik's official channels for patches or updates addressing this vulnerability.
CVE-2026-39042: n/a
Description
A denial of service vulnerability exists in MikroTik RouterOS versions 7.21.x before 7.21.4 and 7.22.x before 7.22.2. The issue is triggered remotely via the unflatten() function in the libumsg.so library, allowing an attacker to disrupt service.
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-39042 is a denial of service vulnerability in MikroTik RouterOS affecting versions 7.21.x prior to 7.21.4 and 7.22.x prior to 7.22.2. The flaw is located in the unflatten() function within the libumsg.so component, which can be exploited remotely to cause the system to become unavailable. No CVSS score or detailed exploit information is provided, and no vendor advisory or patch links are included in the data.
Potential Impact
Successful exploitation results in denial of service, causing affected MikroTik RouterOS devices to become unresponsive or crash. This disrupts network operations relying on these devices. There is no indication of code execution or data compromise from the provided information.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since affected versions are explicitly stated, users should verify if their RouterOS installations fall within these versions and monitor MikroTik's official channels for patches or updates addressing this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-04-06T00:00:00.000Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a5560a568715ace43f2b523
Added to database: 07/13/2026, 22:03:17 UTC
Last enriched: 07/13/2026, 22:17:44 UTC
Last updated: 07/13/2026, 22:37:49 UTC
Views: 4
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