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CVE-2026-41253

Published: Apr 18, 2026

Modified: Apr 20, 2026

PUBLISHED

CVSS v3.1

6.9

MEDIUM

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.

Vendor	Product	Versions
iTerm2	iTerm2	affected `0 - <= 3.6.9`

Weaknesses (CWE)

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Local

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

Low

References

https://iterm2.com/downloads.html

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

https://github.com/gnachman/iTerm2/commit/a9e745993c2e2cbb30b884a16617cd5495899f86

https://news.ycombinator.com/item?id=47809190

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