---
id: "CVE-2026-112519"
kind: "vulnerability"
aliases: ["CVE-2026-112519"]
title: "macOS: integer overflow in VNC client lets a malicious server crash it"
severity: "low"
cvss: null
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["infrastructure", "macos", "screen-sharing", "vnc"]
not_affected_if: ["no-vnc-client-use"]
published_at: "2026-10-26T21:17:43+00:00"
first_seen_at: "2026-10-26T21:20:27+00:00"
updated_at: "2026-10-26T21:29:30+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-112519", "first_seen_at": "2026-10-26T21:20:27+00:00"}]
---

# macOS: integer overflow in VNC client lets a malicious server crash it

An integer overflow in macOS's VNC connection handling can be triggered when a Mac connects to a malicious VNC server. The sources say the result is a denial of service, meaning the connecting process or service can be made to crash or stop responding.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- `sw_vers -productVersion` to read the installed macOS version and compare it with the fixed releases
- Check System Settings > General > Software Update for pending updates
- unknown whether the sources give a specific check for VNC use

## Fix

- Update macOS to `27.2` (Golden Gate), `15.8.2` (Sequoia) or `26.7.2` (Tahoe) or later
- Avoid connecting to untrusted VNC servers until patched

## Timeline

- 2026-10-26T21:20:27+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-112519

## From the sources

An integer overflow was addressed with improved input validation. This issue is fixed in macOS Golden Gate 27.2, macOS Sequoia 15.8.2, macOS Tahoe 26.7.2. Connecting to a malicious VNC server may cause a denial-of-service.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_