What is the CVSS score of CVE-2026-2447?

CVE-2026-2447 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

Which versions of Mozilla are affected by CVE-2026-2447?

A critical heap buffer overflow in libvpx affects multiple Firefox and Thunderbird versions, potentially allowing attackers to execute arbitrary code through malicious video content.. A patch is available.

Mozilla CVE-2026-2447

Q: How to fix or mitigate CVE-2026-2447?

Within 24 hours: Identify and inventory all Firefox and Thunderbird installations across the organization using asset management tools; issue urgent communication to users advising against opening untrusted video content. Within 7 days: Disable hardware video acceleration in Firefox/Thunderbird via group policy or configuration management to reduce attack surface; prepare and stage browser version updates once patches are released. Within 30 days: Deploy patched Firefox (≥147.0.4), Firefox ESR (≥140.7.1 or ≥115.32.1), Thunderbird (≥140.7.2 or ≥147.0.2) to all endpoints; verify patch deployment and confirm vulnerability remediation.

HIGH

Heap-based Buffer Overflow (CWE-122)

2026-02-16 security@mozilla.org

Buffer Overflow Heap Overflow Mozilla

8.8

CVSS 3.1

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Patch released

Apr 09, 2026 - 20:30 nvd

Patch available

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

CVE Published

Feb 16, 2026 - 15:18 nvd

HIGH 8.8

DescriptionNVD

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.

AnalysisAI

Heap buffer overflow in libvpx affects Firefox and Thunderbird across multiple versions, enabling remote code execution when a user interacts with malicious content. An unauthenticated attacker can exploit this vulnerability over the network without special privileges to achieve complete system compromise including data theft and integrity violations. …

RemediationAI

Within 24 hours: Identify and inventory all Firefox and Thunderbird installations across the organization using asset management tools; issue urgent communication to users advising against opening untrusted video content. Within 7 days: Disable hardware video acceleration in Firefox/Thunderbird via group policy or configuration management to reduce attack surface; prepare and stage browser version updates once patches are released. …

Analysis

Detailed AI-generated intelligence summary covering attack vector, impact assessment, affected versions, remediation steps, and indicators of compromise.

POChttps://••••••••••.com/exploit

PATCHhttps://••••••••••.com/patch

ADVISORYhttps://••••••••••.com/advisory

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CVE-2026-2447 vulnerability details – vuln.today

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Mozilla CVE-2026-2447

CVSS VectorNVD

Lifecycle Timeline

DescriptionNVD

AnalysisAI

RemediationAI

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External POC / Exploit Code