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Mozilla EUVDEUVD-2026-14853

| CVE-2026-4719 HIGH
Improper Check for Unusual or Exceptional Conditions (CWE-754)
2026-03-24 mozilla
Mozilla Information Disclosure Red Hat Suse
High
Disputed · 7.5 NVD
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Severity by source

Sources disagree (Low–High)
NVD PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SUSE
HIGH
qualitative
Red Hat
3.4 LOW
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorNVD

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

4
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
EUVD ID Assigned
Mar 24, 2026 - 12:45 euvd
EUVD-2026-14853
Analysis Generated
Mar 24, 2026 - 12:45 vuln.today
CVE Published
Mar 24, 2026 - 12:30 nvd
HIGH 7.5

DescriptionCVE.org

Incorrect boundary conditions in the Graphics: Text component. This vulnerability affects Firefox < 149 and Firefox ESR < 140.9.

AnalysisAI

A boundary condition vulnerability exists in Firefox's Graphics Text component that allows information disclosure through incorrect memory handling during text rendering operations. This affects Firefox versions below 149 and Firefox ESR versions below 140.9, potentially enabling attackers to read sensitive data from adjacent memory regions. No active exploitation in the wild has been confirmed, but the vulnerability warrants prompt patching given its information disclosure impact.

Technical ContextAI

The vulnerability resides in the Graphics Text rendering subsystem of Mozilla Firefox, a core component responsible for font rasterization, glyph layout, and text display operations. Boundary condition errors in this component typically arise from improper validation of buffer sizes, stride calculations, or glyph metrics during text composition and rendering. The root cause aligns with CWE-125 (Out-of-bounds Read) or CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer), common categories for graphics rendering vulnerabilities where off-by-one errors or unchecked array accesses can leak adjacent memory. The affected CPEs are cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* and cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*, indicating all versions below the patched thresholds are vulnerable.

RemediationAI

Upgrade Mozilla Firefox to version 149 or later immediately, and upgrade Firefox ESR to version 140.9 or later if using the Extended Support Release channel. Both updates are available through the official Mozilla website and auto-update mechanisms. Users should enable automatic updates if not already enabled to receive the patch without manual intervention. Until patching is completed in environments where immediate updates are not feasible, minimize exposure by disabling JavaScript if acceptable for workflow, restricting browsing to trusted sites that do not serve adversarial content, and avoiding opening untrusted documents or HTML files. See official advisories at https://www.mozilla.org/security/advisories/mfsa2026-20/ and https://www.mozilla.org/security/advisories/mfsa2026-22/ for complete remediation guidance.

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Vendor StatusVendor

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) -

SUSE

Severity: High
Product Status
Image SLES15-SP5-SAP-Azure-LI-BYOS Image SLES15-SP5-SAP-Azure-LI-BYOS-Production Image SLES15-SP5-SAP-Azure-VLI-BYOS Image SLES15-SP5-SAP-Azure-VLI-BYOS-Production Image SLES15-SP6-SAP-Azure-LI-BYOS Image SLES15-SP6-SAP-Azure-LI-BYOS-Production Image SLES15-SP6-SAP-Azure-VLI-BYOS Image SLES15-SP6-SAP-Azure-VLI-BYOS-Production Image SLES15-SP7-SAP-Azure-LI-BYOS-Production Image SLES15-SP7-SAP-Azure-VLI-BYOS-Production Affected
SUSE Liberty Linux 10 Fixed
SUSE Liberty Linux 8 Fixed
SUSE Liberty Linux 9 Fixed
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7 Fixed

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EUVD-2026-14853 vulnerability details – vuln.today
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