Mozilla Firefox up to 147.0.3 libvpx heap-based overflow

CVSS Meta Temp Score
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CTI Interest Score
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7.4$5k-$25k0.00

Summaryinfo

A vulnerability was found in Mozilla Firefox up to 147.0.3. It has been classified as critical. Impacted is an unknown function of the component libvpx. Performing a manipulation results in heap-based overflow. This vulnerability is reported as CVE-2026-2447. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as critical, was found in Mozilla Firefox up to 147.0.3. This affects an unknown code block of the component libvpx. The manipulation with an unknown input leads to a heap-based overflow vulnerability. CWE is classifying the issue as 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(). This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at bugzilla.mozilla.org. This vulnerability is uniquely identified as CVE-2026-2447 since 02/13/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 03/10/2026).

The vulnerability scanner Nessus provides a plugin with the ID 299214 (Mozilla Thunderbird < 147.0.2), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 147.0.4 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (299214), EUVD (EUVD-2026-6081) and CERT Bund (WID-SEC-2026-0427). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • RESF Rocky Linux
  • Mozilla Firefox
  • Mozilla Firefox ESR
  • Mozilla Thunderbird

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.6
VulDB Meta Temp Score: 7.4

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

ADP CISA Base Score: 8.8
ADP CISA Vector: 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Heap-based overflow
CWE: CWE-122 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 299214
Nessus Name: Mozilla Thunderbird < 147.0.2

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Firefox 147.0.4

Timelineinfo

02/13/2026 CVE reserved
02/16/2026 +3 days Advisory disclosed
02/16/2026 +0 days VulDB entry created
03/10/2026 +22 days VulDB entry last update

Sourcesinfo

Vendor: mozilla.org
Product: mozilla.org

Advisory: bugzilla.mozilla.org
Status: Confirmed

CVE: CVE-2026-2447 (🔒)
GCVE (CVE): GCVE-0-2026-2447
GCVE (VulDB): GCVE-100-346197
EUVD: 🔒
CERT Bund: WID-SEC-2026-0427 - Mozilla Firefox, Firefox ESR und Thunderbird: Mehrere Schwachstellen

Entryinfo

Created: 02/16/2026 16:11
Updated: 03/10/2026 15:59
Changes: 02/16/2026 16:11 (56), 02/16/2026 18:16 (1), 02/17/2026 05:28 (2), 02/17/2026 12:42 (7), 02/17/2026 14:45 (1), 02/18/2026 06:24 (11), 02/18/2026 14:29 (1), 02/25/2026 23:26 (2), 03/10/2026 15:59 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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