CVE-2026-8954
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Incorrect Boundary Conditions and Integer Overflow in Firefox Audio/Video Component

Publication date: 2026-05-19

Last updated on: 2026-05-19

Assigner: Mozilla Corporation

Description
Incorrect boundary conditions, integer overflow in the Audio/Video component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
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Meta Information
Published
2026-05-19
Last Modified
2026-05-19
Generated
2026-06-10
AI Q&A
2026-05-19
EPSS Evaluated
2026-06-08
NVD
CVE-2026-8954
EUVD
EUVD-2026-30906
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
mozilla firefox to 151.0.0 (exc)
mozilla firefox to 140.11.0 (exc)
mozilla thunderbird to 140.11 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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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.
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Executive Summary

This vulnerability involves incorrect boundary conditions and an integer overflow in the Audio/Video component of Mozilla Firefox.

An integer overflow occurs when an arithmetic operation attempts to create a numeric value that is outside the range that can be represented with a given number of bits, potentially leading to unexpected behavior.

Incorrect boundary conditions mean that the software does not properly check or enforce limits on data sizes or values, which can be exploited.

This issue was fixed in Firefox version 151 and Firefox ESR 140.11.

Mitigation Strategies

To mitigate this vulnerability, update Firefox to version 151 or later, or Firefox ESR to version 140.11 or later, where the issue has been fixed.

Impact Analysis

This vulnerability involves incorrect boundary conditions and an integer overflow in the Audio/Video component of Firefox. It has a CVSS v3.1 base score of 7.5, indicating a high severity. The impact is a high confidentiality impact (C:H) with no impact on integrity or availability. This means an attacker could potentially access or leak sensitive information without user interaction or privileges.

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