CVE-2026-2447
Received Received - Intake
Heap Buffer Overflow in libvpx Affecting Firefox Before

Publication date: 2026-02-16

Last updated on: 2026-04-13

Assigner: Mozilla Corporation

Description
Heap buffer overflow in libvpx. This vulnerability was fixed in Firefox 147.0.4, Firefox ESR 140.7.1, Firefox ESR 115.32.1, Thunderbird 140.7.2, and Thunderbird 147.0.2.
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Meta Information
Published
2026-02-16
Last Modified
2026-04-13
Generated
2026-06-16
AI Q&A
2026-02-16
EPSS Evaluated
2026-06-14
NVD
CVE-2026-2447
EUVD
EUVD-2026-6081
Affected Vendors & Products
Showing 5 associated CPEs
Vendor Product Version / Range
mozilla firefox to 147.0.4 (exc)
mozilla thunderbird to 140.7.2 (exc)
mozilla thunderbird From 141.0 (inc) to 147.0.2 (exc)
mozilla firefox to 115.32.1 (exc)
mozilla firefox From 116.0 (inc) to 140.7.1 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-122 A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
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Executive Summary

CVE-2026-2447 is a high-impact security vulnerability caused by a heap buffer overflow in the libvpx library used by Mozilla Firefox.

This vulnerability affects Firefox versions earlier than 147.0.4 and Firefox ESR versions earlier than 140.7.1 and 115.32.1.

A heap buffer overflow means that the program writes more data to a buffer located in the heap than it is allocated to hold, which can lead to memory corruption.

Impact Analysis

The heap buffer overflow in libvpx can lead to memory corruption, which poses significant security risks.

Memory corruption vulnerabilities can potentially be exploited to execute arbitrary code, crash the application, or cause other unpredictable behavior.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

To mitigate this vulnerability, you should update Mozilla Firefox to version 147.0.4 or later, or update Firefox ESR to version 115.32.1 or 140.7.1 or later, where the heap buffer overflow in libvpx has been fixed.

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