What is CVE-2026-33054?

CVE-2026-33054 is a critical-severity vulnerability in Mesop-dev Mesop, classified under Path Traversal. CVSS score: 10.0/10. Published 2026-03-20.

How severe is CVE-2026-33054?

Critical severity. CVSS v3 base score is 10.0 out of 10.

Path Traversal in Mesop-dev Mesop

CVE-2026-33054

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 arbi…

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.000 (10.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

Affected products

Mesop-dev Mesop — versions < 1.2.3

Weakness classification (CWE)

CWE-22 — Path Traversal

References

https://github.com/mesop-dev/mesop/security/advisories/GHSA-8qvf-mr4w-9x2c (x_refsource_CONFIRM)
https://github.com/mesop-dev/mesop/commit/c6b382f363b73ac32c402a2db3aadc7784f66a5b (x_refsource_MISC)
https://github.com/mesop-dev/mesop/releases/tag/v1.2.3 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-33054?: CVE-2026-33054 is a critical-severity vulnerability in Mesop-dev Mesop, classified under Path Traversal. CVSS score: 10.0/10. Published 2026-03-20.
How severe is CVE-2026-33054?: Critical severity. CVSS v3 base score is 10.0 out of 10.