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CVE-2026-33054

10.0 · CRITICAL

Mesop is a Python-based UI framework that allows users to build web applications.

Published Mar 20, 2026CWE-22EPSS 0.73%

Overview

CVE-2026-33054 is a critical-severity vulnerability. It was published on March 20, 2026 and has a CVSS 3.1 base score of 10.0 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 10.0, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Mesop is a Python-based UI framework that allows users to build web applications. Versions 1.2.2 and below contain a Path Traversal vulnerability that allows any user supplying an untrusted state_token through the UI stream payload to arbitrarily target files on the disk under the standard file-based runtime backend. This can result in application denial of service (via crash loops when reading non-msgpack target files as configurations), or arbitrary file manipulation. This vulnerability heavily exposes systems hosted utilizing FileStateSessionBackend. Unauthorized malicious actors could interact with arbitrary payloads overwriting or explicitly removing underlying service resources natively outside the application bounds. This issue has been fixed in version 1.2.3.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/mesop-dev/mesop/commit/c6b382f363b73ac32c402a2db3aadc7784f66a5bGitHubgithub.com/mesop-dev/mesop/releases/tag/v1.2.3GitHubgithub.com/mesop-dev/mesop/security/advisories/GHSA-8qvf-mr4w-9x2cGitHubgithub.com/mesop-dev/mesop/security/advisories/GHSA-8qvf-mr4w-9x2c

How CyberStrike helps

Frequently asked questions

What is CVE-2026-33054?

CVE-2026-33054 is a critical-severity vulnerability. It was published on March 20, 2026 and has a CVSS 3.1 base score of 10.0 (CRITICAL).

How severe is CVE-2026-33054?

This vulnerability has a CVSS 3.1 base score of 10.0, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-33054?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-33054?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-33054 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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