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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.

PUBLISHED Reserved 2026-04-18 | Published 2026-04-18 | Updated 2026-04-20 | Assigner mitre




MEDIUM: 6.9CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

Problem types

CWE-829 Inclusion of Functionality from Untrusted Control Sphere

Product status

Default status
unknown

Any version
affected

References

iterm2.com/downloads.html

blog.calif.io/p/mad-bugs-even-cat-readmetxt-is-not

github.com/...ommit/a9e745993c2e2cbb30b884a16617cd5495899f86

news.ycombinator.com/item?id=47809190

cve.org (CVE-2026-41253)

nvd.nist.gov (CVE-2026-41253)

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