---
id: CVE-2026-88350
title: >-
  An integer overflow vulnerability exists in MPack 1.1.1 in
  mpack_node_cstr_alloc() and mpack_node_utf8_cstr_alloc().
summary: >-
  An integer overflow vulnerability exists in MPack 1.1.1 in
  mpack_node_cstr_alloc() and mpack_node_utf8_cstr_alloc().
severity: medium
cvss: 6.2
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-190
published: '2026-09-22'
updated: '2026-10-01'
sourceUpdated: '2026-10-01T17:17:32.413'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88350'
references:
  - url: >-
      https://github.com/ludocode/mpack/commit/3d54d1215bdb5478d3ddecaf85884c58b382cd9b
    label: cve@mitre.org
  - url: 'https://github.com/ludocode/mpack/issues/124'
    label: cve@mitre.org
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-01T16:27:04.290477Z'
epss: 0.0012
epssPercentile: 0.0183
ingestedAt: '2026-09-22T20:10:15.096Z'
---

## Overview

An integer overflow vulnerability exists in MPack 1.1.1 in mpack_node_cstr_alloc() and mpack_node_utf8_cstr_alloc().

## Remediation

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