PT-2026-33591 · Iterm2 · Iterm2

Published 2026-04-18 · Updated 2026-04-18 · CVE-2026-41253

Mitre

CVSS v3.1

6.9

Medium

AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

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.

Fix

Weakness Enumeration

CWE-829

Related Identifiers

CVE-2026-41253

Affected Products

Iterm2

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-41253 · Security Note
• https://news.ycombinator.com/item?id=47809190 · Note
• https://iterm2.com/downloads.html · Note
• https://blog.calif.io/p/mad-bugs-even-cat-readmetxt-is-not · Note
• https://github.com/gnachman/iTerm2/commit/a9e745993c2e2cbb30b884a16617cd5495899f86 · Note