CVE-2026-100756

Analyzed Analyzed - Analysis Complete

Incorrect Boundary Conditions in Firefox Audio/Video Playback

Publication date: 2026-09-29

Last updated on: 2026-10-06

Assigner: Mozilla Corporation

Description

Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-29

Last Modified

2026-10-06

Generated

2026-10-19

AI Q&A

2026-09-29

EPSS Evaluated

2026-10-18

NVD

CVE-2026-100756

EUVD

EUVD-2026-88908

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	From 154.0.0 (inc) to 157.0.0 (exc)
mozilla	thunderbird	From 154.0 (inc) to 157.0 (exc)
mozilla	thunderbird	From 140.0 (inc) to 140.17.0 (exc)
mozilla	thunderbird	From 153.0 (inc) to 153.4.0 (exc)
mozilla	firefox	From 140.0.0 (inc) to 140.17.0 (exc)
mozilla	firefox	From 153.0.0 (inc) to 153.4.0 (exc)
mozilla	firefox	From 115.0 (inc) to 115.42.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-119	The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

Attack-Flow Graph

Executive Summary

CVE-2026-100756 is a security flaw in Firefox's Audio/Video: Playback component caused by incorrect boundary conditions. This means the software fails to properly validate or handle data boundaries during audio/video playback, potentially leading to memory corruption or other security issues.

Detection Guidance

This vulnerability affects Firefox browsers, specifically versions before ESR 153.4, Firefox 157, ESR 115.42, and ESR 140.17. To detect it, check your Firefox version using the 'about:support' page in Firefox or run 'firefox --version' in the terminal. If your version is older than the patched releases, update immediately.

Impact Analysis

This vulnerability could allow attackers to execute arbitrary code, crash the application, or gain unauthorized access to sensitive data by exploiting the boundary condition flaws in Firefox's audio/video playback functionality.

Compliance Impact

The provided CVE data does not specify how this vulnerability affects compliance with standards like GDPR or HIPAA. The vulnerability involves incorrect boundary conditions in Firefox's Audio/Video Playback component, but no direct impact on regulatory compliance is mentioned.

Mitigation Strategies

Update Firefox ESR to version 153.4 or later, Firefox to version 157 or later, Firefox ESR 115 to version 42 or later, and Firefox ESR 140 to version 17 or later to address the incorrect boundary conditions in the Audio/Video: Playback component.

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