Cisco NX-OS Python sandbox escape (CVE-2026-20032) lets low-privileged local users run OS commands
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Cisco disclosed CVE-2026-20032, a Medium-rated vulnerability in the Python interpreter of Cisco NX-OS Software. An authenticated local attacker with low privileges and Python execution rights can escape the Python sandbox and reach the underlying operating system of the device. The flaw stems from insufficient validation of user-supplied input. Cisco has released software updates and states that no workarounds exist. The advisory is part of Cisco's October 7, 2026 advance-notification bundle. The article does not report exploitation in the wild.
Technical Details
- The attacker manipulates specific functions within the Python interpreter to break out of the sandbox.
- A successful exploit allows arbitrary command execution on the underlying OS with the privileges of the authenticated user.
- Exploitation requires authentication with Python execution privileges, as described in the Cisco Nexus 9000 Series NX-OS Programmability Guide.
- The vector is local, so the attacker needs prior access to the device.
Remediation
- Apply the Cisco software updates that fix this vulnerability.
- No workarounds are available.
- Review and restrict which accounts have Python execution privileges on NX-OS devices.
Linha do tempo
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sec.cloudapps.cisco.com ↗ · pub. 07/10/2026 13:00 · coletado 19/10 18:01 primeiro registro só resumo do feed
Cisco NX-OS Python sandbox escape (CVE-2026-20032) lets low-privileged local users run OS commands
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Cisco disclosed CVE-2026-20032, a Medium-rated vulnerability in the Python interpreter of Cisco NX-OS Software. An authenticated local attacker with low privileges and Python execution rights can escape the Python sandbox and reach the underlying operating system of the device. The flaw stems from insufficient validation of user-supplied input. Cisco has released software updates and states that no workarounds exist. The advisory is part of Cisco's October 7, 2026 advance-notification bundle. The article does not report exploitation in the wild.
Technical Details
- The attacker manipulates specific functions within the Python interpreter to break out of the sandbox.
- A successful exploit allows arbitrary command execution on the underlying OS with the privileges of the authenticated user.
- Exploitation requires authentication with Python execution privileges, as described in the Cisco Nexus 9000 Series NX-OS Programmability Guide.
- The vector is local, so the attacker needs prior access to the device.
Remediation
- Apply the Cisco software updates that fix this vulnerability.
- No workarounds are available.
- Review and restrict which accounts have Python execution privileges on NX-OS devices.