CVE catalog
CVE-2026-33642
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 3
- Severity
- Critical · CVSS 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.29% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | kitty | sid | 0.48.2-1.1 | fixed |
| Debian | kitty | forky | 0.48.2-1.1 | fixed |
| Debian | kitty | trixie | 0.41.1-2+deb13u2 | fixed |
| Debian | kitty | trixie-security | 0.41.1-2+deb13u2 | fixed |
| Debian | kitty | bookworm | 0.26.5-5 | vulnerable |
| Cpe | kitty | Not reported | 0.32.2-1ubuntu0.4+esm1 | fixed |
| Cpe | kitty-doc | Not reported | 0.32.2-1ubuntu0.4+esm1 | fixed |
| Cpe | kitty-shell-integration | Not reported | 0.32.2-1ubuntu0.4+esm1 | fixed |
| Cpe | kitty-terminfo | Not reported | 0.32.2-1ubuntu0.4+esm1 | fixed |
| Cpe | kitty | Not reported | Not reported | vulnerable |
| Cpe | kitty | Not reported | 0.47.0 | fixed |
| Ubuntu | kitty | pro | 0.41.1-2 | vulnerable |
| Ubuntu | kitty | pro | 0.43.1-1 | vulnerable |
| Ubuntu | kitty | pro | 0.44.0-1 | vulnerable |
| Ubuntu | kitty | pro | 0.45.0-1 | vulnerable |
| Ubuntu | kitty | pro | 0.45.0-1build1 | vulnerable |
| Ubuntu | kitty | pro | 0.45.0-1ubuntu0.1~esm1 | fixed |
| Ubuntu | kitty | 25.10 | 0.39.1-1 | vulnerable |
| Ubuntu | kitty | 25.10 | 0.41.1-2 | vulnerable |
| Ubuntu | kitty | 25.10 | 0.41.1-2+deb13u1build0.25.10.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | kitty | source | sid | 0.47.0-1 | not yet assigned | Not reported | [1137210] |
| Debian | kitty | source | forky | 0.47.0-1 | not yet assigned | Not reported | [1137210] |
| Debian | kitty | source | trixie | 0.41.1-2+deb13u1 | not yet assigned | Not reported | [1137210] |
| Debian | kitty | source | bookworm | (unfixed) | not yet assigned | Not reported | [1137210] |
| Cpe | kitty | cpe | Not reported | 0.32.2-1ubuntu0.4+esm1 | Not reported | Not reported | Not reported |
| Cpe | kitty-doc | cpe | Not reported | 0.32.2-1ubuntu0.4+esm1 | Not reported | Not reported | Not reported |
| Cpe | kitty-shell-integration | cpe | Not reported | 0.32.2-1ubuntu0.4+esm1 | Not reported | Not reported | Not reported |
| Cpe | kitty-terminfo | cpe | Not reported | 0.32.2-1ubuntu0.4+esm1 | Not reported | Not reported | Not reported |
| Cpe | kitty | cpe | Not reported | 0.47.0 | Not reported | Not reported | Not reported |
| Ubuntu | kitty | deb | pro | 0.45.0-1ubuntu0.1~esm1 | Not reported | UBUNTU-CVE-2026-33642 | Not reported |
| Ubuntu | kitty | deb | 25.10 | 0.41.1-2+deb13u1build0.25.10.1 | Not reported | UBUNTU-CVE-2026-33642 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [kitty]Affected
Details (2)
0.26.5-5· amd64 · bookwormAffected
nvd · kitty · debian · bookworm; nvd · kitty · debian · 12
0.26.5-5· arm64 · bookwormAffected
nvd · kitty · debian · bookworm; nvd · kitty · debian · 12
- [kitty-doc]Affected
Source package: [kitty]
Details (2)
0.26.5-5· all · bookwormAffected
nvd · kitty · debian · bookworm; nvd · kitty · debian · 12
0.26.5-5· all · bookwormAffected
nvd · kitty · debian · bookworm; nvd · kitty · debian · 12
- [kitty-shell-integration]Affected
Source package: [kitty]
Details (2)
0.26.5-5· all · bookwormAffected
nvd · kitty · debian · bookworm; nvd · kitty · debian · 12
0.26.5-5· all · bookwormAffected
nvd · kitty · debian · bookworm; nvd · kitty · debian · 12
- [kitty-terminfo]Affected
Source package: [kitty]
Details (2)
0.26.5-5· all · bookwormAffected
nvd · kitty · debian · bookworm; nvd · kitty · debian · 12
0.26.5-5· all · bookwormAffected
nvd · kitty · debian · bookworm; nvd · kitty · debian · 12
[Debian 13 (Trixie)]
- [kitty]Fixed
Details (4)
0.41.1-2+deb13u1· amd64 · trixieFixed · Fixed:
0.41.1-2+deb13u1nvd · kitty · debian · 13
0.41.1-2+deb13u1· arm64 · trixieFixed · Fixed:
0.41.1-2+deb13u1nvd · kitty · debian · 13
0.41.1-2+deb13u2· amd64 · trixie-securityFixed · Fixed:
0.41.1-2+deb13u1nvd · kitty · debian · 13
0.41.1-2+deb13u2· arm64 · trixie-securityFixed · Fixed:
0.41.1-2+deb13u1nvd · kitty · debian · 13
- [kitty-doc]Fixed
Source package: [kitty]
Details (4)
0.41.1-2+deb13u1· all · trixieFixed · Fixed:
0.41.1-2+deb13u1nvd · kitty · debian · 13
0.41.1-2+deb13u1· all · trixieFixed · Fixed:
0.41.1-2+deb13u1nvd · kitty · debian · 13
0.41.1-2+deb13u2· all · trixie-securityFixed · Fixed:
0.41.1-2+deb13u1nvd · kitty · debian · 13
0.41.1-2+deb13u2· all · trixie-securityFixed · Fixed:
0.41.1-2+deb13u1nvd · kitty · debian · 13
- [kitty-shell-integration]Fixed
Source package: [kitty]
Details (4)
0.41.1-2+deb13u1· all · trixieFixed · Fixed:
0.41.1-2+deb13u1nvd · kitty · debian · 13
0.41.1-2+deb13u1· all · trixieFixed · Fixed:
0.41.1-2+deb13u1nvd · kitty · debian · 13
0.41.1-2+deb13u2· all · trixie-securityFixed · Fixed:
0.41.1-2+deb13u1nvd · kitty · debian · 13
0.41.1-2+deb13u2· all · trixie-securityFixed · Fixed:
0.41.1-2+deb13u1nvd · kitty · debian · 13
- [kitty-terminfo]Fixed
Source package: [kitty]
Details (4)
0.41.1-2+deb13u1· all · trixieFixed · Fixed:
0.41.1-2+deb13u1nvd · kitty · debian · 13
0.41.1-2+deb13u1· all · trixieFixed · Fixed:
0.41.1-2+deb13u1nvd · kitty · debian · 13
0.41.1-2+deb13u2· all · trixie-securityFixed · Fixed:
0.41.1-2+deb13u1nvd · kitty · debian · 13
0.41.1-2+deb13u2· all · trixie-securityFixed · Fixed:
0.41.1-2+deb13u1nvd · kitty · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_21599-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-33642]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-33642]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-33642]
- [https://security-tracker.debian.org/tracker/CVE-2026-33642]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33642.json]
- [https://ubuntu.com/security/notices/USN-8442-1]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]