CVE-2026-2447
Heap Buffer Overflow in libvpx Affecting Firefox Before
Publication date: 2026-02-16
Last updated on: 2026-04-13
Assigner: Mozilla Corporation
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
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 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
AI Powered Q&A
Can you explain this vulnerability to me?
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.
How can this vulnerability impact me? :
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.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
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.