Unauthenticated RCE in Mesop AI testing /exec-py endpoint
CVE-2026-33057 is an unrestricted remote code execution vulnerability in Mesop, a Python-based UI framework for building web applications. It affects Mesop 1.2.2 and earlier. The flaw is in the AI testing/debug infrastructure, specifically a lightweight Flask server in ai/sandbox/wsgi_app.py that exposes the /exec-py route. That endpoint accepts base64-encoded Python source via the code POST parameter, writes the supplied content to disk, and executes it through execute_module(module_path...). Because the endpoint ingests and evaluates untrusted Python code without authentication or other access controls, any reachable attacker can cause arbitrary Python code to run on the host system.
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Impact, mitigation & remediation
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Impact
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Mitigation
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Remediation
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Exploits
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No public exploit code observed for this vulnerability.
Affected products & vendors
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Recent activity
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Unknown
An unauthenticated remote code execution vulnerability in Mesop versions 1.2.2 and below, caused by a web endpoint in the ai/testing infrastructure that accepts and executes untrusted Python code.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.