What is CVE-2026-33642?

CVE-2026-33642 is a critical-severity vulnerability in Kovidgoyal Kitty, classified under Out-of-bounds Read. CVSS score: 9.9/10. Published 2026-05-19.

How severe is CVE-2026-33642?

Critical severity. CVSS v3 base score is 9.9 out of 10.

Out-of-bounds Read in Kovidgoyal Kitty

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 32-bit arithmetic that is subject to int…

Vulnerability class: Buffer Overflow

EPSS: 0.001 (19.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:H.

Affected products

Kovidgoyal Kitty — versions < 0.47.0

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)

Frequently asked questions

What is CVE-2026-33642?: CVE-2026-33642 is a critical-severity vulnerability in Kovidgoyal Kitty, classified under Out-of-bounds Read. CVSS score: 9.9/10. Published 2026-05-19.
How severe is CVE-2026-33642?: Critical severity. CVSS v3 base score is 9.9 out of 10.