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Mozilla EUVDEUVD-2026-14829

| CVE-2026-4707 HIGH
Improper Check for Unusual or Exceptional Conditions (CWE-754)
2026-03-24 mozilla
Mozilla Information Disclosure Red Hat Suse
7.5
CVSS 3.1 · NVD
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Severity by source

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
6.1 MEDIUM
qualitative

Primary rating from NVD.

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-2026-14829
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: Canvas2D component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, and Firefox ESR < 140.9.

AnalysisAI

A boundary condition vulnerability exists in Mozilla Firefox's Graphics Canvas2D component that enables information disclosure attacks. The vulnerability affects Firefox versions below 149, Firefox ESR below 115.34, and Firefox ESR below 140.9. An attacker can exploit incorrect boundary condition handling in Canvas2D operations to read sensitive data from memory, potentially disclosing user information or browser-internal data through a web-based attack vector.

Technical ContextAI

The vulnerability resides in the Canvas2D graphics rendering component, a core HTML5 Canvas API implementation in Firefox's rendering engine. Canvas2D operations involve buffer management and pixel manipulation at the graphics abstraction layer. The root cause is categorized as an incorrect boundary condition issue, meaning the code fails to properly validate or enforce memory access limits during Canvas2D operations. This affects the entire Firefox family across multiple ESR (Extended Support Release) branches: standard Firefox (cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*) and both Firefox ESR product lines (cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*). The boundary condition flaw likely permits out-of-bounds memory reads when processing canvas drawing commands, allowing attackers to access unintended memory regions.

RemediationAI

Immediately upgrade Mozilla Firefox to version 149 or later, Firefox ESR to version 115.34 or later, or Firefox ESR to version 140.9 or later, depending on your installation branch. Consult https://www.mozilla.org/security/advisories/mfsa2026-20/, https://www.mozilla.org/security/advisories/mfsa2026-21/, and https://www.mozilla.org/security/advisories/mfsa2026-22/ for detailed upgrade instructions specific to your ESR branch. For organizations unable to patch immediately, restrict user access to untrusted web content and disable Canvas2D functionality if operationally feasible through browser policies or content security policies. Monitor Firefox update channels for availability of patches if they have not yet been released, as this appears to be a coordinated vulnerability disclosure with patches expected imminently.

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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-2026-14829 vulnerability details – vuln.today
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