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[USN-8763-1] kitty vulnerabilities

Posted on 15 September 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8763-1
September 15, 2026

kitty vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS

Summary:

Several security issues were fixed in kitty.

Software Description:
- kitty: fast, featureful, GPU based terminal emulator

Details:

It was discovered that kitty incorrectly escaped error messages when
handling specially crafted terminal escape sequences. A remote attacker
could possibly use this issue to execute arbitrary commands.
(CVE-2026-42850)

It was discovered that kitty incorrectly handled remote edit requests in
terminal output. An attacker could possibly use this issue to execute
arbitrary code with the user's privileges.
(CVE-2026-42851)

Thai Son Dinh and Nguyen Huy Vu Dung discovered that kitty incorrectly
handled destination paths in its file transmission protocol. A local
attacker could possibly use this issue to overwrite arbitrary files with
the user's privileges.
(CVE-2026-54055)

It was discovered that kitty incorrectly sanitized responses to color
queries. An attacker could possibly use this issue to execute arbitrary
commands with the user's privileges. This issue only affected Ubuntu
26.04 LTS. (CVE-2026-54057)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
kitty 0.45.0-1ubuntu0.1~esm2
Available with Ubuntu Pro

Ubuntu 24.04 LTS
kitty 0.32.2-1ubuntu0.4+esm2
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8763-1
CVE-2026-42850, CVE-2026-42851, CVE-2026-54055, CVE-2026-54057

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