---
id: CVE-2026-106971
title: >-
  An integer overflow in the MessagePack\BufferUnpacker component of
  rybakit/msgpack versions prior to 0.11.0 allows attackers to cause a denial of
  service via crafted MessagePack input when the application runs on 32-bit PHP
summary: >-
  An integer overflow in the MessagePack\BufferUnpacker component of
  rybakit/msgpack versions prior to 0.11.0 allows attackers to cause a denial of
  service via crafted MessagePack input when the application runs on 32-bit PHP
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: adp
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-11-03T12:25:58.586014Z'
exploitAvailable: true
published: '2026-10-28'
updated: '2026-11-03'
sourceUpdated: '2026-11-03T12:26:13.361Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-106971'
references:
  - url: 'https://github.com/rybakit/msgpack.php'
  - url: 'https://github.com/rybakit/msgpack.php/releases/tag/v0.11.0'
  - url: >-
      https://github.com/diptendukar/security-advisories/blob/main/CVE-2026-106971.md
tags:
  - cve.org
  - exploit-available
epss: 0.00339
epssPercentile: 0.275
ingestedAt: '2026-10-28T15:13:08.985Z'
---

## Overview

An integer overflow in the MessagePack\BufferUnpacker component of rybakit/msgpack versions prior to 0.11.0 allows attackers to cause a denial of service via crafted MessagePack input when the application runs on 32-bit PHP

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.