Is Firefox affected by CVE-2026-4699?

CVE-2026-4699 presents notable security risk rated CVSS 7.5. Exploitation could compromise the security of affected deployments. Organizations should apply vendor updates when available and consider compensating controls in the interim.

CVE-2026-4699

Q: How to fix CVE-2026-4699?

Within 7 days: Identify all affected systems and apply vendor patches promptly. Monitor vendor channels for patch availability.

EUVD-2026-14815 HIGH

2026-03-24 mozilla

GHSA-2qjw-h8g8-r86f

7.5

CVSS 3.1

CVSS Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Patch Released

Mar 31, 2026 - 21:13 nvd

Patch available

Analysis Generated

Mar 24, 2026 - 12:45 vuln.today

EUVD ID Assigned

Mar 24, 2026 - 12:45 euvd

EUVD-2026-14815

CVE Published

Mar 24, 2026 - 12:30 nvd

HIGH 7.5

Description

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

Analysis

A boundary condition vulnerability exists in Firefox's Layout: Text and Fonts component that can lead to information disclosure. This affects Firefox versions below 149, Firefox ESR versions below 115.34, and Firefox ESR versions below 140.9. …

Remediation

Within 7 days: Identify all affected systems and apply vendor patches promptly. Monitor vendor channels for patch availability.

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

Full analysis requires sign-in

Get intelligence summaries, risk assessment, exploit details, threat intel, and remediation guidance.

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +0.0

CVSS: +38

POC: 0

Vendor Status

Debian

firefox

Release	Status	Fixed Version	Urgency
sid	vulnerable	148.0.2-1	-
(unstable)	fixed	(unfixed)	-

firefox-esr

Release	Status	Fixed Version	Urgency
bullseye	vulnerable	115.14.0esr-1~deb11u1	-
bullseye (security)	vulnerable	140.8.0esr-1~deb11u1	-
bookworm	vulnerable	128.14.0esr-1~deb12u1	-
bookworm (security)	vulnerable	140.8.0esr-1~deb12u1	-
trixie (security), trixie	vulnerable	140.8.0esr-1~deb13u1	-
forky, sid	vulnerable	140.8.0esr-1	-
(unstable)	fixed	(unfixed)	-

CVE-2026-4699 vulnerability details – vuln.today

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CVE-2026-4699

CVSS Vector

Lifecycle Timeline

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Description

Analysis

Remediation

Analysis

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Priority Score

Vendor Status

Debian

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CVE-2026-4699

CVSS Vector

Lifecycle Timeline

Tags

Description

Analysis

Remediation

Full analysis requires sign-in

Priority Score

Vendor Status

Debian

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External POC / Exploit Code