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CVE-2026-33054

Mesop-dev Mesop path traversal

10.0 CRITICALPublic exploitEPSS 0.70%
  1. Published20 Mar 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

Mesop-dev Mesop< 1.2.3

Remediation

Fixed in
Mesop-dev Mesop≥ 1.2.3

References

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Frequently asked

Is CVE-2026-33054 being actively exploited?

CVE-2026-33054 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.70%.

How severe is CVE-2026-33054?

CVE-2026-33054 has a CVSS 3.1 base score of 10.0, rated critical. EPSS estimates a 0.70% probability of exploitation.

Which products are affected by CVE-2026-33054?

Affected products include Mesop-dev Mesop.

How do I fix CVE-2026-33054?

Upgrade affected software to a fixed version, for example Mesop-dev Mesop 1.2.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-33054 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.