---
id: CVE-2026-95121
title: >-
  An issue in mp4v2 2.0.0 allows an attacker to execute arbitrary code via the
  MP4RtpAtom::ReadHntiType() in src/atom_rtp.cpp
summary: >-
  An issue in mp4v2 2.0.0 allows an attacker to execute arbitrary code via the
  MP4RtpAtom::ReadHntiType() in src/atom_rtp.cpp. A specially crafted MP4 file
  can cause an undersized rtp atom to produce a near-2^64 allocation size
  through an …
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-190
published: '2026-10-13'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T19:56:15.773'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-95121'
references:
  - url: 'https://gist.github.com/1820893135-pixel/c56b6a1627453e67ca2fb7e29bae95c6'
    label: cve@mitre.org
  - url: 'https://github.com/TechSmith/mp4v2/issues/98'
    label: cve@mitre.org
  - url: 'https://github.com/TechSmith/mp4v2/pull/100'
    label: cve@mitre.org
  - url: >-
      https://github.com/TechSmith/mp4v2/pull/100/changes/c7f4e1da1b75996a053b05b69be8e738bf77a26c
    label: cve@mitre.org
  - url: 'https://github.com/TechSmith/mp4v2/issues/98'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00201
epssPercentile: 0.09841
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-14T19:18:34.978156Z'
ingestedAt: '2026-10-13T15:33:40.085Z'
---

## Overview

An issue in mp4v2 2.0.0 allows an attacker to execute arbitrary code via the MP4RtpAtom::ReadHntiType() in src/atom_rtp.cpp. A specially crafted MP4 file can cause an undersized rtp atom to produce a near-2^64 allocation size through an unchecked offset subtraction

## Remediation

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