---
id: "CVE-2026-123200"
kind: "vulnerability"
aliases: ["CVE-2026-123200"]
title: "VRPN: out-of-bounds stack write lets remote peers crash the process"
severity: "high"
cvss: 8.7
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["c++", "package", "self-hosted", "virtual-reality", "vrpn"]
not_affected_if: ["no-vrpn-in-use", "not-network-exposed"]
published_at: "2026-11-05T19:17:18+00:00"
first_seen_at: "2026-11-05T19:40:35+00:00"
updated_at: "2026-11-05T19:42:49+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-123200", "first_seen_at": "2026-11-05T19:40:35+00:00"}]
exploit_sources: []
---

# VRPN: out-of-bounds stack write lets remote peers crash the process

VRPN, a library for networking virtual reality devices, has an out-of-bounds stack write in its sender and type message handlers. An unauthenticated remote peer can crash the process by sending a malformed description message with an out-of-range or negative index.

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

## How to check

- Check whether any system runs VRPN at or before version `07.36`, the range the description names.
- Look for VRPN servers or endpoints reachable from untrusted networks.

## Fix

- A patch is linked from github.com; the sources do not state the fixed version.

## Timeline

- 2026-11-05T19:40:35+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-123200

## Documents

- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/vrpn-through-07.36-out-of-bounds-write-via-sender-description-type-description-length-index
- [fix] Patch: github.com https://github.com/vrpn/vrpn/commit/0da5b0b71e06e8c318a4e674c84caee12251a782
- [fix] Patch: github.com https://github.com/vrpn/vrpn/commit/c893b583d928fd17d756b39271b2eae71766e7f2

## From the sources

VRPN through 07.36 contains an out-of-bounds stack write vulnerability in vrpn_Endpoint::handle_sender_message() and handle_type_message() that allows unauthenticated remote peers to write outside a stack buffer via an unchecked length index. Attackers can connect, complete the version-cookie exchange, and send a SENDER_DESCRIPTION or TYPE_DESCRIPTION message with an out-of-range or negative index to crash the process.

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