CVE-2026-8091

Modified Modified - Updated After Analysis

Incorrect Boundary Handling in Firefox ESR Playback Component

Publication date: 2026-05-07

Last updated on: 2026-06-30

Assigner: Mozilla Corporation

Description

Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, Thunderbird 140.10.1, and Firefox ESR 115.35.2.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-05-07

Last Modified

2026-06-30

Generated

2026-07-07

AI Q&A

2026-05-07

EPSS Evaluated

2026-07-06

NVD

CVE-2026-8091

EUVD

EUVD-2026-28362

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	From 140.0 (inc) to 140.10.1 (exc)
mozilla	firefox	to 115.35.2 (exc)
mozilla	thunderbird	From 140.0 (inc) to 140.10.1 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-754	The product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product.
CWE-805	The product uses a sequential operation to read or write a buffer, but it uses an incorrect length value that causes it to access memory that is outside of the bounds of the buffer.

Attack-Flow Graph

Executive Summary

CVE-2026-8091 is a security vulnerability found in the Audio/Video: Playback component of Firefox ESR. It involves incorrect boundary conditions, which means that the software does not properly handle limits or edges in processing audio and video data.

This flaw could lead to memory corruption or other unintended behaviors during audio and video playback, potentially causing the browser to behave unpredictably or insecurely.

The vulnerability was discovered by the Mozilla Fuzzing Team and has been classified as having a high impact. It was fixed in Firefox ESR versions 140.10.2 and 115.35.2.

Impact Analysis

This vulnerability can impact users by potentially causing memory corruption or other unintended behaviors when playing audio or video content in Firefox ESR.

Such memory corruption could be exploited by attackers to execute arbitrary code, crash the browser, or cause other security issues, leading to compromised system security or loss of data integrity.

Mitigation Strategies

To mitigate this vulnerability, you should update your Firefox ESR browser to version 140.10.2 or later, or to version 115.35.2 or later.

These versions contain fixes for the incorrect boundary conditions in the Audio/Video: Playback component that cause this vulnerability.

Compliance Impact

There is no information provided in the available resources or CVE description about how this vulnerability affects compliance with common standards and regulations such as GDPR or HIPAA.

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