CVE-2026-33642

CRITICAL EPSS 20.3%
Published May 19, 20261mo ago · Modified Jun 17, 20262w ago
9.8 CVSS 3.1
Critical
Find Similar
Published May 19, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago

Description

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 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.

CVSS Details

Base Score
9.8
Exploitability
3.9
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
20.3% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 3

CWE-125 Out-of-bounds Read Memory Safety
CWE-190 Integer Overflow or Wraparound Numeric Error
CWE-787 Out-of-bounds Write Memory Safety

Affected Products 1

VendorProductVersionRange
kovidgoyalkitty* <0.47.0

References 2

  • github.com https://github.com/kovidgoyal/kitty/commit/e9661f0f3afb4e4dbffa509adfb3df3c9780ad34
    Patch
  • github.com https://github.com/kovidgoyal/kitty/security/advisories/GHSA-qfgm-2c64-6x3x
    ExploitMitigationVendor Advisory

Remediation

  • github.com https://github.com/kovidgoyal/kitty/commit/e9661f0f3afb4e4dbffa509adfb3df3c9780ad34
    Patch