CVE-2026-88914

Publication date 11 September 2026

Last updated 30 September 2026

Ubuntu priority

Cvss 3 Severity Score

Description

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.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
gst-plugins-good1.0	26.04 LTS resolute	Vulnerable
	24.04 LTS noble	Vulnerable
	22.04 LTS jammy	Vulnerable
	20.04 LTS focal	Vulnerable
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
gst-plugins-good1.0	Upstream: a2a14d1 Upstream: c297f67

Severity score breakdown

CVSS version: CVSS v3.0

Base score 4.4 · Medium

Base metrics

Parameter	Value
Attack vector	Local
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality impact	Low
Integrity impact	None
Availability impact	Low

Scores

Parameter	Value
Base score	4.4 · Medium
Exploitability score	-
Impact score	-

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L