SB2026092262 - Debian update for kitty
Published: September 22, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 vulnerabilities.
1) Heap-based buffer overflow (CVE-ID: CVE-2026-33633)
CWE-ID: CWE-122 - Heap-based Buffer Overflow
CVSSv4: 7.1 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a heap-based buffer overflow in the load_image_data() function in kitty/graphics.c when processing a PNG-format Kitty graphics protocol command whose payload exceeds the resized buffer capacity. A remote attacker can send a specially crafted graphics protocol command to cause a denial of service.
User interaction is required to process the malicious terminal input.
2) Integer overflow (CVE-ID: CVE-2026-33642)
CWE-ID: CWE-190 - Integer overflow
CVSSv4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service, disclose sensitive information, or corrupt heap memory.
The vulnerability exists due to integer overflow in the handle_compose_command() bounds check in kitty/graphics.c when processing crafted graphics escape sequences. A remote attacker can send crafted graphics escape sequences to a kitty terminal to cause a denial of service, disclose sensitive information, or corrupt heap memory.
No user interaction or non-default configuration is required.
Remediation
Install update from vendor's website.