CVE-2026-2447
Heap buffer overflow in libvpx
Description
Heap buffer overflow in libvpx. This vulnerability affects Firefox < 147.0.4, Firefox ESR < 140.7.1, Firefox ESR < 115.32.1, Thunderbird < 140.7.2, and Thunderbird < 147.0.2.
INFO
Published Date :
Feb. 16, 2026, 3:18 p.m.
Last Modified :
Feb. 22, 2026, 9:16 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-2447
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Update Firefox to version 147.0.4 or later.
- Update Firefox ESR to version 140.7.1 or later.
- Update Firefox ESR to version 115.32.1 or later.
Public PoC/Exploit Available at Github
CVE-2026-2447 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-2447.
| URL | Resource |
|---|---|
| https://bugzilla.mozilla.org/show_bug.cgi?id=2014390 | Issue TrackingPermissions Required |
| https://www.mozilla.org/security/advisories/mfsa2026-10/ | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2026-11/ | Vendor Advisory |
| https://lists.debian.org/debian-lts-announce/2026/02/msg00028.html |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-2447 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-2447
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
Shell Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-2447 vulnerability anywhere in the article.
-
The Cyber Express
Critical Security Flaws Discovered in Four VS Code Extensions Affecting Millions
Researchers have uncovered vulnerabilities in four widely used VS Code extensions, collectively installed more than 125 million times, raising renewed concerns about the security of the modern softwar ... Read more
-
The Cyber Express
Mozilla Firefox Issues Emergency Patch for Heap Buffer Overflow in Firefox v147
Mozilla has released an out-of-band security update to address a critical vulnerability affecting its browser. The update, issued as Firefox v147.0.4, resolves a high-impact Heap buffer overflow flaw ... Read more
-
CybersecurityNews
Firefox v147.0.3 Released With Fix for Heap Buffer Overflow Vulnerability
Firefox v147.0.3 Released Mozilla has released Firefox version 147.0.3, addressing a critical memory-related flaw that could allow attackers to execute arbitrary code by exploiting a heap buffer overf ... Read more
The following table lists the changes that have been made to the
CVE-2026-2447 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Feb. 22, 2026
Action Type Old Value New Value Added Reference https://lists.debian.org/debian-lts-announce/2026/02/msg00028.html -
Initial Analysis by [email protected]
Feb. 18, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* versions up to (excluding) 147.0.4 *cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* versions up to (excluding) 140.7.2 *cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* versions from (including) 141.0 up to (excluding) 147.0.2 *cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* versions up to (excluding) 115.32.1 *cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* versions from (including) 116.0 up to (excluding) 140.7.1 Added Reference Type Mozilla Corporation: https://bugzilla.mozilla.org/show_bug.cgi?id=2014390 Types: Issue Tracking, Permissions Required Added Reference Type Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2026-10/ Types: Vendor Advisory Added Reference Type Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2026-11/ Types: Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Feb. 17, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Added CWE CWE-122 -
CVE Modified by [email protected]
Feb. 16, 2026
Action Type Old Value New Value Changed Description Heap buffer overflow in libvpx. This vulnerability affects Firefox < 147.0.4, Firefox ESR < 140.7.1, and Firefox ESR < 115.32.1. Heap buffer overflow in libvpx. This vulnerability affects Firefox < 147.0.4, Firefox ESR < 140.7.1, Firefox ESR < 115.32.1, Thunderbird < 140.7.2, and Thunderbird < 147.0.2. Added Reference https://www.mozilla.org/security/advisories/mfsa2026-11/ -
New CVE Received by [email protected]
Feb. 16, 2026
Action Type Old Value New Value Added Description Heap buffer overflow in libvpx. This vulnerability affects Firefox < 147.0.4, Firefox ESR < 140.7.1, and Firefox ESR < 115.32.1. Added Reference https://bugzilla.mozilla.org/show_bug.cgi?id=2014390 Added Reference https://www.mozilla.org/security/advisories/mfsa2026-10/