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Vulnerabilities ›

CVE-2026-4699

High

Incorrect boundary conditions in the Layout: Text and Fonts component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

CWE-754 — Weakness Type

                    Published: Mar 24, 2026                      ·  Modified: Mar 30, 2026                      ·  Source: NVD                

CVSS v3

7.5

🔗 NVD Official

📄 Description (English)

Incorrect boundary conditions in the Layout: Text and Fonts component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

🤖

Queued for AI Analysis

This CVE will be auto-analyzed on the next cron run.

🔗 References & Sources 6

https://bugzilla.mozilla.org/show_bug.cgi?id=2021863

security@mozilla.org

Permissions Required

https://www.mozilla.org/security/advisories/mfsa2026-20/

security@mozilla.org

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026-21/

security@mozilla.org

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026-22/

security@mozilla.org

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026-23/

security@mozilla.org

https://www.mozilla.org/security/advisories/mfsa2026-24/

security@mozilla.org

📦 Affected Products / CPE 3 entries

mozilla:firefox

mozilla:firefox

mozilla:firefox

📊 CVSS Score

7.5

/ 10.0 — High

📊 CVSS Vector

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

Attack VectorN — None / Network

Attack ComplexityL — Low / Local

Privileges RequiredN — None / Network

User InteractionN — None / Network

ScopeU — Unchanged

ConfidentialityN — None / Network

IntegrityN — None / Network

AvailabilityH — High

📋 Quick Facts

Severity High

CVSS Score7.5

CWECWE-754

Exploit No

Patch ✗ No

Published 2026-03-24

Source Feed nvd

🏷️ Tags

CWE-754

🏢 Vendor Advisories

🔗 https://www.mozilla.org/security/advisories/mfsa2026... 🔗 https://www.mozilla.org/security/advisories/mfsa2026... 🔗 https://www.mozilla.org/security/advisories/mfsa2026...

⚡ Actions

🔗 NVD Official Page ⚡ Exploit-DB Search 🐙 GitHub PoC Search 🎯 MITRE ATT&CK 📊 CVE Details

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