CVE-2026-2447

Modified Modified - Updated After Analysis

Heap Buffer Overflow in libvpx Affecting Firefox Before

Publication date: 2026-02-16

Last updated on: 2026-06-30

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.

CVSS Scores

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Meta Information

Published

2026-02-16

Last Modified

2026-06-30

Generated

2026-07-06

AI Q&A

2026-02-16

EPSS Evaluated

2026-07-05

NVD

CVE-2026-2447

EUVD

EUVD-2026-6081

Affected Vendors & Products

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

KEV

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().

Attack-Flow Graph

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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