{"id":"CVE-2026-41253","aliases":["EUVD-2026-23656","GHSA-5pgv-4jf4-9r43"],"status":"published","title":"In iTerm2 through 3.6.9, displaying a .txt file can cause code execution via DCS 2000p and OSC...","description":"In iTerm2 through 3.6.9, displaying a .txt file can cause code execution via DCS 2000p and OSC 135 data, if the working directory contains a malicious file whose name is valid output from the conductor encoding path, such as a pathname with an initial ace/c+ substring, aka \"hypothetical in-band signaling abuse.\" This occurs because iTerm2 accepts the SSH conductor protocol from terminal output that does not originate from a legitimate conductor session.","severity":{"version":"3.1","score":6.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00199,"percentile":0.09722,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-829"],"published":"2026-04-18T05:27:08Z","modified":"2026-10-28T02:30:37Z","products":[{"vendor":"iterm2","product":"iterm2"}],"references":[{"url":"https://iterm2.com/downloads.html","tags":["Product","web"]},{"url":"https://blog.calif.io/p/mad-bugs-even-cat-readmetxt-is-not","tags":["Exploit","Third Party Advisory","article"]},{"url":"https://github.com/gnachman/iTerm2/commit/a9e745993c2e2cbb30b884a16617cd5495899f86","tags":["Patch","fix"]},{"url":"https://news.ycombinator.com/item?id=47809190","tags":["Issue Tracking","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-41253","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-5pgv-4jf4-9r43"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41253.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-41253","description":"In iTerm2 through 3.6.9, displaying a .txt file can cause code execution via DCS 2000p and OSC 135 data, if the working directory contains a malicious file whose name is valid output from the conductor encoding path, such as a pathname with an initial ace/c+ substring, aka \"hypothetical in-band signaling abuse.\" This occurs because iTerm2 accepts the SSH conductor protocol from terminal output that does not originate from a legitimate conductor session.","status":"published","published":"2026-04-18T05:27:08.202Z","modified":"2026-04-20T15:52:10.357Z","cvss":[{"version":"3.1","score":6.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-829"],"updated_at":"2026-11-02T13:41:08.498858Z"}],"euvd":[{"id":"EUVD-2026-23656","description":"In iTerm2 through 3.6.9, displaying a .txt file can cause code execution via DCS 2000p and OSC 135 data, if the working directory contains a malicious file whose name is valid output from the conductor encoding path, such as a pathname with an initial ace/c+ substring, aka \"hypothetical in-band signaling abuse.\" This occurs because iTerm2 accepts the SSH conductor protocol from terminal output that does not originate from a legitimate conductor session.","status":"published","published":"2026-04-18T05:27:08Z","modified":"2026-04-20T15:52:10Z","cvss":[{"version":"3.1","score":6.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"medium"}],"updated_at":"2026-11-02T19:24:22.446697Z"}],"ghsa":[{"id":"GHSA-5pgv-4jf4-9r43","title":"In iTerm2 through 3.6.9, displaying a .txt file can cause code execution via DCS 2000p and OSC...","description":"In iTerm2 through 3.6.9, displaying a .txt file can cause code execution via DCS 2000p and OSC 135 data, if the working directory contains a malicious file whose name is valid output from the conductor encoding path, such as a pathname with an initial ace/c+ substring, aka \"hypothetical in-band signaling abuse.\" This occurs because iTerm2 accepts the SSH conductor protocol from terminal output that does not originate from a legitimate conductor session.","status":"published","published":"2026-04-18T06:30:14Z","modified":"2026-04-18T06:30:19Z","cvss":[{"version":"3.1","score":6.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"medium"}],"cwes":["CWE-829"],"updated_at":"2026-11-02T15:07:32.404178Z"}],"nvd":[{"id":"CVE-2026-41253","description":"In iTerm2 through 3.6.9, displaying a .txt file can cause code execution via DCS 2000p and OSC 135 data, if the working directory contains a malicious file whose name is valid output from the conductor encoding path, such as a pathname with an initial ace/c+ substring, aka \"hypothetical in-band signaling abuse.\" This occurs because iTerm2 accepts the SSH conductor protocol from terminal output that does not originate from a legitimate conductor session.","status":"published","published":"2026-04-18T06:16:17.427Z","modified":"2026-06-17T10:46:23.35Z","cvss":[{"version":"3.1","score":6.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"medium","assessor":"secondary"},{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-829"],"updated_at":"2026-11-02T14:12:15.120927Z"}],"osv":[{"id":"CVE-2026-41253","description":"In iTerm2 through 3.6.9, displaying a .txt file can cause code execution via DCS 2000p and OSC 135 data, if the working directory contains a malicious file whose name is valid output from the conductor encoding path, such as a pathname with an initial ace/c+ substring, aka \"hypothetical in-band signaling abuse.\" This occurs because iTerm2 accepts the SSH conductor protocol from terminal output that does not originate from a legitimate conductor session.","status":"published","published":"2026-04-18T05:27:08.202Z","modified":"2026-10-28T02:30:37.956720302Z","cvss":[{"version":"3.1","score":6.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"medium"}],"cwes":["CWE-829"],"updated_at":"2026-11-02T15:45:03.764807Z"}]}}