Mesop: Unauthenticated ANSI Escape Sequence Injection in CSP Reporting Endpoint

[ Description ]Official description

Mesop is a Python-based UI framework that allows users to build web applications. Prior to 1.3.4, the unauthenticated /__csp__ endpoint passes attacker-controlled document-uri, blocked-uri, and violated-directive values to the csp_report handler in mesop/server/static_file_serving.py, which prints them to standard output without neutralizing terminal control sequences. When an operator views the resulting logs in an ANSI-capable terminal, injected ANSI or VT100 sequences can clear or reposition the display, hide text, or present forged messages, reducing the integrity of monitoring and incident-response output. This issue is fixed in version 1.3.4.

[ Fixes ]Fixes and patches

• mesop 1.3.4Fixed version · GitHub Advisories · pip package mesop: upgrade to 1.3.4 or later (affected <= 1.3.3)

[ Packages ]Affected open-source packages

• mesop pipAffected <= 1.3.3 · fixed in 1.3.4 · GHSA-g7f6-rxc4-qhph

[ References ]References

• github.com/mesop-dev/mesop/commit/f38c42a1d3eba246941ef8d7f645072d53c58785
• github.com/mesop-dev/mesop/pull/1397
• github.com/mesop-dev/mesop/releases/tag/v1.3.4
• github.com/mesop-dev/mesop/security/advisories/GHSA-g7f6-rxc4-qhph