CVE-2026-33633: Kovidgoyal Kitty

High severity, CVSS 8.8. EPSS: 0.5% chance of exploitation in the next 30 days.

Kitty is a cross-platform GPU based terminal. Versions 0.46.2 and below contain a heap buffer overflow in load_image_data() that allows any process which can write to the terminal's stdin to crash kitty immediately. The vulnerability is triggered by a single APC graphics protocol command with a PNG format declaration (f=100) whose payload exceeds twice the initial buffer capacity. The overflow is attacker-controlled in both length and content, causing DoS and potentially escalation to RCE itself. This issue has been fixed in version 0.47.0.

Affected products

• Kovidgoyal Kitty: before 0.47.0 (fixed in 0.47.0)

Published 2026-05-19. Last modified 2026-07-24.