{"cve":"CVE-2026-93421","nvd":{"published":"2026-09-23T19:19:45.140","modified":"2026-09-30T17:32:07.107","status":"Deferred","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.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N","score":5.3},"cvss_v3":null,"cwes":["CWE-117","CWE-150"],"references":["https://github.com/mesop-dev/mesop/commit/f38c42a1d3eba246941ef8d7f645072d53c58785","https://github.com/mesop-dev/mesop/pull/1397","https://github.com/mesop-dev/mesop/releases/tag/v1.3.4","https://github.com/mesop-dev/mesop/security/advisories/GHSA-g7f6-rxc4-qhph"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:56:02.509636177+00:00"},"epss":{"cve":"CVE-2026-93421","score":0.00528,"percentile":0.44399,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-g7f6-rxc4-qhph","url":"https://osv.dev/vulnerability/GHSA-g7f6-rxc4-qhph","summary":"Mesop: Unauthenticated ANSI Escape Sequence Injection in CSP Reporting Endpoint","modified":"2026-10-01T17:55:47.100968033Z","packages":[{"ecosystem":"PyPI","name":"mesop","purl":"pkg:pypi/mesop","ranges":["<1.3.4"],"fixed":["1.3.4"]}]},{"id":"PYSEC-2026-4105","url":"https://osv.dev/vulnerability/PYSEC-2026-4105","summary":"Mesop: Unauthenticated ANSI Escape Sequence Injection in CSP Reporting Endpoint","modified":"2026-10-01T17:45:10.035276068Z","packages":[{"ecosystem":"PyPI","name":"mesop","purl":"pkg:pypi/mesop","ranges":["<1.3.4"],"fixed":["1.3.4"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}