GHSA-gjgx-rvqr-6w6v: mesop (CVE-2026-33057)

Mesop Affected by Unauthenticated Remote Code Execution via Test Suite Route /exec-py

CVSS 9.8 CriticalCriticalEPSS 0.066 · 93rd percentile

Critical, because:

CVSS score 9.8: 9.0 or more.

Published by the GitHub Advisory Database at 29 Jun 2026, 11:50 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
mesop	PyPI	<1.2.3	1.2.3

Identifiers

GHSA-gjgx-rvqr-6w6v · CVE-2026-33057 · PYSEC-2026-412

Weakness (CWE)

CWE-94

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Mesop versions before 1.2.3 are affected. A debugging test server in the ai/ module exposes an endpoint that executes submitted Python code without any authentication, so anyone who can send HTTP requests to it can run commands on the host machine. The fix is to upgrade to Mesop 1.2.3 or later.

Written 6 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
9.8	Critical	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.066, the 93rd percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 15:04 UTC First seen by agentprime
31 Oct 2026, 15:04 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.