# CVE-2026-33642: kitty: Kitty is a cross-platform GPU based terminal

CVE-2026-33642 is fixed in 3 products on 1 platform, first by kitty 0.15.0-1ubuntu0.2+esm1, released May 19, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2026-33642
- Priority: Urgent
- CVSS: 9.8 (critical)
- EPSS: 0.0029
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 19, 2026

## Description

Kitty is a cross-platform GPU based terminal. In versions 0.46.2 and below, the handle_compose_command() function in kitty/graphics.c performs bounds validation on composition offsets using unsigned 32-bit arithmetic that is subject to integer wrapping, potentially leading to Heap Buffer Over-Read/Write. An attacker who can write escape sequences to a kitty terminal (e.g., via a malicious file, SSH login banner, or piped content) can supply crafted x_offset/y_offset values that pass the bounds check after wrapping but cause massive out-of-bounds heap memory access in compose_rectangles(). No user interaction is required. No non-default configuration is required. The attacker only needs the ability to produce output in a kitty terminal window. This issue has been fixed in version 0.47.0.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | kitty Debian 13.5 (trixie) | 0.41.1-2+deb13u1 | [DEBIAN-CVE-2026-33642](https://patchblox.com/security/data/fix/linux/debian-cve-2026-33642.md) | May 27, 2026 |
| Linux | kitty Debian 14 | 0.47.0-1 | [DEBIAN-CVE-2026-33642](https://patchblox.com/security/data/fix/linux/debian-cve-2026-33642.md) | May 27, 2026 |
| Linux | kitty Ubuntu 20.04 LTS (focal) | 0.15.0-1ubuntu0.2+esm1 | [kitty 0.15.0-1ubuntu0.2+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-kitty-0.15.0-1ubuntu0.2-esm1.md) | May 19, 2026 |
| Linux | kitty Ubuntu 22.04.1 LTS (jammy) | 0.21.2-1ubuntu0.22.04.1+esm1 | [kitty 0.21.2-1ubuntu0.22.04.1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-kitty-0.21.2-1ubuntu0.22.04.1-esm1.md) | May 19, 2026 |
| Linux | kitty Ubuntu 24.04.5 LTS (noble) | 0.32.2-1ubuntu0.4+esm1 | [kitty 0.32.2-1ubuntu0.4+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-kitty-0.32.2-1ubuntu0.4-esm1.md) | May 19, 2026 |
| Linux | kitty Ubuntu 25.10 (questing) | 0.41.1-2+deb13u1build0.25.10.1 | [kitty 0.41.1-2+deb13u1build0.25.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-kitty-0.41.1-2-deb13u1build0.25.10.1.md) | May 19, 2026 |
| Linux | kitty Ubuntu 26.04.1 LTS (resolute) | 0.45.0-1ubuntu0.1~esm1 | [kitty 0.45.0-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-kitty-0.45.0-1ubuntu0.1-esm1.md) | May 19, 2026 |
| Linux | kitty opensuse-leap 16.0 | 0.48.2-bp160.1.1 | [OPENSUSE-SU-2026:21599-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21599-1.md) | Aug 18, 2026 |
| Linux | kitty-shell-integration Ubuntu 24.04.5 LTS (noble) | 0.32.2-1ubuntu0.4+esm1 | [kitty-shell-integration 0.32.2-1ubuntu0.4+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-kitty-shell-integration-0.32.2-1ubuntu0.4-esm1.md) | May 19, 2026 |
| Linux | kitty-shell-integration Ubuntu 25.10 (questing) | 0.41.1-2+deb13u1build0.25.10.1 | [kitty-shell-integration 0.41.1-2+deb13u1build0.25.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-kitty-shell-integration-0.41.1-2-deb13u1build0.25.10.1.md) | May 19, 2026 |
| Linux | kitty-shell-integration Ubuntu 26.04.1 LTS (resolute) | 0.45.0-1ubuntu0.1~esm1 | [kitty-shell-integration 0.45.0-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-kitty-shell-integration-0.45.0-1ubuntu0.1-esm1.md) | May 19, 2026 |
| Linux | kitty-terminfo Ubuntu 20.04 LTS (focal) | 0.15.0-1ubuntu0.2+esm1 | [kitty-terminfo 0.15.0-1ubuntu0.2+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-kitty-terminfo-0.15.0-1ubuntu0.2-esm1.md) | May 19, 2026 |
| Linux | kitty-terminfo Ubuntu 24.04.5 LTS (noble) | 0.32.2-1ubuntu0.4+esm1 | [kitty-terminfo 0.32.2-1ubuntu0.4+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-kitty-terminfo-0.32.2-1ubuntu0.4-esm1.md) | May 19, 2026 |
| Linux | kitty-terminfo Ubuntu 25.10 (questing) | 0.41.1-2+deb13u1build0.25.10.1 | [kitty-terminfo 0.41.1-2+deb13u1build0.25.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-kitty-terminfo-0.41.1-2-deb13u1build0.25.10.1.md) | May 19, 2026 |
| Linux | kitty-terminfo Ubuntu 26.04.1 LTS (resolute) | 0.45.0-1ubuntu0.1~esm1 | [kitty-terminfo 0.45.0-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-kitty-terminfo-0.45.0-1ubuntu0.1-esm1.md) | May 19, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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