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Cisco NX-OS Python Sandbox Escape Vulnerability Disclosed

First seen 8 Oct 2026, 06:31 UTC • •
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ThreatCluster •October 8, 2026 at 07:31 UTC
  • •CVE-2026-20032 allows local attackers to escape Python sandbox in Cisco NX-OS.
  • •Cisco has released patches; no workarounds are available for this vulnerability.
  • •Affected systems include Cisco Nexus 9000 Series devices running vulnerable NX-OS versions.

A vulnerability identified as CVE-2026-20032 affects the Python interpreter in Cisco NX-OS Software, allowing authenticated local attackers with low privileges to escape the Python sandbox and gain unauthorized access to the underlying operating system. This flaw arises from insufficient validation of user-supplied input, enabling attackers to manipulate specific functions within the interpreter. Cisco has released software updates to address this vulnerability, but no workarounds are available. The vulnerability impacts devices running affected versions of Cisco NX-OS Software, specifically within the Cisco Nexus 9000 Series. The advisory was published on October 7, 2026, and is part of a broader set of advisories from Cisco. Security professionals are urged to review the advisory and apply the necessary updates.

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Timeline

2026-10-07
CVE-2026-20032 published
Cisco disclosed a vulnerability in the Python interpreter of NX-OS Software, affecting local authenticated users.
Sec.Cloudapps.Cisco
2026-10-08
Advisory updated
Cisco's advisory on the Python sandbox escape vulnerability was updated with additional details and links to patches.
sec.cloudapps.cisco.com

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Common questions

Which devices are affected?
The vulnerability affects devices running Cisco NX-OS Software, particularly in the Nexus 9000 Series.
What is the nature of the vulnerability?
It allows authenticated local attackers to escape the Python sandbox due to insufficient input validation.
What should I do to protect my systems?
Review the Cisco advisory for patch details and apply the updates as soon as possible.