CVE-2026-33633

Name	CVE-2026-33633
Description	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1137210

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
kitty (PTS)	bullseye	0.19.3-1	fixed
	bullseye (security)	0.19.3-1+deb11u1	fixed
	bookworm	0.26.5-5	vulnerable
	trixie	0.41.1-2	vulnerable
	forky	0.46.2-1	vulnerable
	sid	0.47.0-2	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
kitty	source	bullseye	(not affected)
kitty	source	(unstable)	0.47.0-1			1137210

Notes

[bullseye] - kitty <not-affected> (frame composition introduced later)
https://github.com/kovidgoyal/kitty/security/advisories/GHSA-j68c-v8x4-269g
Fixed by: https://github.com/kovidgoyal/kitty/commit/48ab623f594d60dbbfb1e767d9686d380ce547fb (v0.47.0)