Buffer overflow in Kovidgoyal Kitty
CVE-2026-33633
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.
Vulnerability class: Buffer Overflow
EPSS: 0.004 (31.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Kovidgoyal Kitty — versions < 0.47.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-33633?
- CVE-2026-33633 is a high-severity vulnerability in Kovidgoyal Kitty, classified under Heap-based Buffer Overflow. CVSS score: 7.5/10. Published 2026-05-19.
- How severe is CVE-2026-33633?
- High severity. CVSS v3 base score is 7.5 out of 10.