Integer Overflow or Wraparound Affecting kovidgoyal/kitty package, versions [,0.47.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-UNMANAGED-KOVIDGOYALKITTY-16779144
- published20 May 2026
- disclosed20 May 2026
- creditRajChowdhury240, rlarabee, dr34mhacks
Introduced: 20 May 2026
CVE-2026-33642 (opens in a new tab)How to fix?
Upgrade kovidgoyal/kitty to version 0.47.0 or higher.
Overview
Affected versions of this package are vulnerable to Integer Overflow or Wraparound via the handle_compose_command() function in kitty/graphics.c performs bounds validation on composition offsets using unsigned 32-bit arithmetic that is subject to integer wrapping, potentially leading to Heap Buffer Over-Read/Write. An attacker who can write escape sequences to a kitty terminal (e.g., via a malicious file, SSH login banner, or piped content) can supply crafted x_offset/y_offset values that pass the bounds check after wrapping but cause massive out-of-bounds heap memory access in compose_rectangles(). No user interaction is required. No non-default configuration is required. The attacker only needs the ability to produce output in a kitty terminal window. This issue has been fixed in version 0.47.0.