---
id: CVE-2026-88914
title: A flaw was found in GStreamer's gst-plugins-good isomp4 plugin
summary: >-
  A flaw was found in GStreamer's gst-plugins-good isomp4 plugin. When
  processing a specially crafted MP4 or MOV file containing CEA-608
  closed-caption data, an integer overflow in 32-bit unsigned arithmetic can
  bypass a bounds check in th…
severity: medium
cvss: 4.4
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L'
cwe:
  - CWE-190
vendor: Red Hat
product: gstreamer1-plugins-good
affected:
  - gstreamer1-plugins-good (all versions)
  - gstreamer-plugins-good (all versions)
  - gstreamer1-plugins-good (all versions)
  - gstreamer-plugins-good (all versions)
  - gstreamer1-plugins-good (all versions)
  - gstreamer1-plugins-good (all versions)
published: '2026-09-11'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T19:42:43.623'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88914'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-88914'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2531416'
    label: secalert@redhat.com
  - url: 'https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/12433'
    label: secalert@redhat.com
  - url: 'https://gstreamer.freedesktop.org/security/sa-2026-0079.html'
    label: secalert@redhat.com
tags:
  - nvd
  - cve.org
epss: 0.00175
epssPercentile: 0.06086
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-11T14:15:37.604687Z'
ingestedAt: '2026-09-12T16:23:26.578Z'
---

## Overview

A flaw was found in GStreamer's gst-plugins-good isomp4 plugin. When processing a specially crafted MP4 or MOV file containing CEA-608 closed-caption data, an integer overflow in 32-bit unsigned arithmetic can bypass a bounds check in the caption parser. This leads to an out-of-bounds heap read of up to 244 bytes, which is then included in the downstream caption output. An attacker could exploit this by tricking a user into opening a malicious media file, potentially resulting in disclosure of adjacent heap memory or application crash.

## Remediation

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