What is the CVSS score of CVE-2026-2781?

CVE-2026-2781 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

Which versions of Mozilla are affected by CVE-2026-2781?

An integer overflow vulnerability in Mozilla's cryptographic library (NSS) affects Firefox and Thunderbird, allowing remote attackers to execute arbitrary code without authentication.. A patch is available.

Mozilla CVE-2026-2781

Q: How to fix or mitigate CVE-2026-2781?

Within 24 hours: Identify and inventory all Firefox and Thunderbird instances across the organization, including ESR deployments. Within 7 days: Deploy vendor patches to Firefox 148+, Firefox ESR 140.8+, Thunderbird 148+, and Thunderbird ESR 140.8+ via MFSA2026-13/15/16/17; verify Red Hat updates for enterprise Linux distributions. Within 30 days: Confirm 100% patch compliance through vulnerability scanning and endpoint management tools; document remediation completion.

CRITICAL

Integer Overflow or Wraparound (CWE-190)

2026-02-24 security@mozilla.org

Buffer Overflow Integer Overflow Mozilla

9.8

CVSS 3.1

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Updated

Apr 21, 2026 - 13:27 vuln.today

v2 (cvss_changed)

Re-analysis Queued

Apr 21, 2026 - 13:22 vuln.today

cvss_changed

Patch released

Apr 10, 2026 - 08:30 nvd

Patch available

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

CVE Published

Feb 24, 2026 - 14:16 nvd

CRITICAL 9.8

DescriptionNVD

Integer overflow in the Libraries component in NSS. This vulnerability affects Firefox < 148, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.

AnalysisAI

Integer overflow in NSS (Network Security Services) cryptographic library enables remote unauthenticated attackers to achieve arbitrary code execution with critical impact on confidentiality, integrity, and availability across Mozilla Firefox (<148, ESR <140.8) and Thunderbird (<148, ESR <140.8). The vulnerability carries a maximum CVSS 9.8 score with no exploitation barriers, though EPSS probability remains low (0.04%, 14th percentile) and no active exploitation is confirmed. …

RemediationAI

Within 24 hours: Identify and inventory all Firefox and Thunderbird instances across the organization, including ESR deployments. Within 7 days: Deploy vendor patches to Firefox 148+, Firefox ESR 140.8+, Thunderbird 148+, and Thunderbird ESR 140.8+ via MFSA2026-13/15/16/17; verify Red Hat updates for enterprise Linux distributions. …

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-2026-2781 vulnerability details – vuln.today

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Mozilla CVE-2026-2781

CVSS VectorNVD

Lifecycle Timeline

DescriptionNVD

AnalysisAI

RemediationAI

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External POC / Exploit Code