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Ubuntu 26.04 LTS kitty Critical Denial of Service Issues USN-8442-1

ubuntu
Calendar Grey June 17, 2026
Scroller Ubuntu Esm H88
Several security issues fixed in Ubuntu kitty terminal affecting multiple releases. Stay updated against critical risks.
Several security issues were fixed in kitty.

Summary

Several security issues were fixed in kitty.

Software Description:

- kitty: The fast, feature-rich, GPU based terminal emulator

Details:

It was discovered that kitty incorrectly handled certain image data. An

attacker able to write to the terminal's input could possibly use this

issue to cause kitty to crash, resulting in a denial of service, or

possibly execute arbitrary code. (CVE-2026-33633)

It was discovered that kitty incorrectly handled certain graphics commands.

An attacker able to write escape sequences to a kitty terminal could

possibly use this issue to cause kitty to crash, resulting in a denial of

service, or possibly execute arbitrary code. (CVE-2026-33642)

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu vulnerability kitten

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~esm1
                                  Available with Ubuntu Pro
  kitty-shell-integration         0.45.0-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro

Ubuntu 25.10
  kitty                           0.41.1-2+deb13u1build0.25.10.1
  kitty-shell-integration         0.41.1-2+deb13u1build0.25.10.1

Ubuntu 24.04 LTS
  kitty                           0.32.2-1ubuntu0.4+esm1
                                  Available with Ubuntu Pro
  kitty-shell-integration         0.32.2-1ubuntu0.4+esm1
                                  Available with Ubuntu Pro

Ubuntu 22.04 LTS
  kitty                           0.21.2-1ubuntu0.22.04.1+esm1
                                  Available with Ubuntu Pro

Ubuntu 20.04 LTS
  kitty                           0.15.0-1ubuntu0.2+esm1
                                  Available with Ubuntu Pro

After a standard system update you need to restart kitty to make all the
necessary changes.

References

https://ubuntu.com/security/notices/USN-8442-1

CVE-2026-33633, CVE-2026-33642

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8442-1

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu vulnerability kitten

Package Information

https://launchpad.net/ubuntu/+source/kitty/0.41.1-2+deb13u1build0.25.10.1

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