{"id":"CVE-2026-93421","summary":"Mesop: Unauthenticated ANSI Escape Sequence Injection in CSP Reporting Endpoint","details":"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.","aliases":["GHSA-g7f6-rxc4-qhph"],"modified":"2026-09-24T11:30:48.501616274Z","published":"2026-09-23T18:59:52.637Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93421.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-117","CWE-150"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93421.json"},{"type":"FIX","url":"https://github.com/mesop-dev/mesop/commit/f38c42a1d3eba246941ef8d7f645072d53c58785"},{"type":"FIX","url":"https://github.com/mesop-dev/mesop/pull/1397"},{"type":"WEB","url":"https://github.com/mesop-dev/mesop/releases/tag/v1.3.4"},{"type":"ADVISORY","url":"https://github.com/mesop-dev/mesop/security/advisories/GHSA-g7f6-rxc4-qhph"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93421"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mesop-dev/mesop","events":[{"introduced":"0"},{"fixed":"09d82e3649cd5b2d6e2aac24c748347a83063211"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"1.3.4"}],"source":"AFFECTED_FIELD"}}],"versions":["v1.3.3","v1.3.2","v1.3.1","v1.3.0","v1.3.0rc2","v1.3.0rc1","v1.2.7","v1.2.7rc1","v1.2.6","v1.2.6rc2","v1.2.6rc1","v1.2.5","v1.2.5c1","v1.2.4rc1","v1.2.3","v1.2.2","v1.2.2rc1","v1.2.1","v1.2.1rc1","v1.2.0","v1.2.0rc1","v1.1.1","v1.1.1rc3","v1.1.1rc2","v1.1.1rc1","v1.1.0","v1.1.0rc1","v1.0.1","v1.0.1rc1","v1.0.0","v1.0.0rc2","v1.0.0rc1","v0.14.2rc1-try3","v0.14.2rc1-try2","v0.14.2rc1","v0.14.1","v0.14.0","v0.13.0","v0.12.9","v0.12.8","v0.12.7","v0.12.6","v0.12.5","v0.12.4","v0.12.3","v0.12.2","v0.12.1","v0.12.0","v0.11.1","v0.11.0","v0.10.0","v0.9.5","v0.9.4","v0.9.3","v0.9.2","v0.9.1","v0.9.0","v0.8.0","v0.7.2","v0.7.1","v0.6.0","v0.5.6","v0.5.5","v0.5.3","v0.5","v0.4.2","v0.4.1","v0.2","v0.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93421.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}