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CVE-2026-33633— Kitty has a Heap Buffer Overflow in its Graphics Protocol Handler

Quick assessment

Affected
kovidgoyal kitty
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

KiTTY是一个轻量级的telnet和WindowsSSH客户端。 Kitty 0.46.2及之前版本存在安全漏洞，该漏洞源于load_image_data()中堆缓冲区溢出，允许写入终端stdin的进程通过APC图形协议命令触发崩溃。

CVSS 7.5 · High EPSS 0.37% · P30

Affected Version Matrix 1

VendorProduct Version RangeStatus
kovidgoyal kitty < 0.47.0 affected
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I. Basic Information for CVE-2026-33633

Vulnerability Information
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Vulnerability Title
Kitty has a Heap Buffer Overflow in its Graphics Protocol Handler
Source: CVE Program / CVE List V5
Vulnerability 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 Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
KiTTY 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
KiTTY是一个轻量级的telnet和WindowsSSH客户端。 Kitty 0.46.2及之前版本存在安全漏洞，该漏洞源于load_image_data()中堆缓冲区溢出，允许写入终端stdin的进程通过APC图形协议命令触发崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
kovidgoyal kitty < 0.47.0 -

II. Public POCs for CVE-2026-33633

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8108 chars
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III. Intelligence Information for CVE-2026-33633

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Patches & Fixes for CVE-2026-33633 (1)

Vendor Advisories for CVE-2026-33633 (1)

IV. Related Vulnerabilities

Same product: kitty
Same vendor: kovidgoyal
Same weakness: CWE-122

V. Comments for CVE-2026-33633

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