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Mozilla EUVDEUVD-2026-14867

| CVE-2026-4726 HIGH
Uncontrolled Resource Consumption (CWE-400)
2026-03-24 mozilla GHSA-2r77-x4qh-mhc3
Mozilla Denial Of Service 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-2026-14867
Analysis Generated
Mar 24, 2026 - 12:45 vuln.today
CVE Published
Mar 24, 2026 - 12:30 nvd
HIGH 7.5

DescriptionCVE.org

Denial-of-service in the XML component. This vulnerability affects Firefox < 149.

AnalysisAI

Firefox versions below 149 are vulnerable to a resource exhaustion attack through malformed XML processing that an unauthenticated attacker can trigger remotely without user interaction. This denial-of-service vulnerability allows attackers to crash affected Firefox instances or degrade performance. No patch is currently available for this vulnerability.

Technical ContextAI

The vulnerability resides in Firefox's XML parsing component, which is responsible for processing and validating XML documents used in web pages, extensions, and internal browser functionality. XML parsers are critical attack surfaces because they often process untrusted input from external sources. The underlying root cause likely involves improper input validation, resource exhaustion, or unhandled exception conditions within the XML processing library (commonly libxml2 or equivalent in Firefox's rendering engine). The affected product is identified via CPE as cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*, indicating all Firefox versions prior to 149 are in scope. Without a specific CWE listed, the vulnerability likely falls under CWE-20 (Improper Input Validation), CWE-400 (Uncontrolled Resource Consumption), or CWE-248 (Uncaught Exception), all common patterns in XML processing flaws.

RemediationAI

Users should immediately upgrade Mozilla Firefox to version 149 or later, which patches the XML component vulnerability. The upgrade can be performed via Help > About Firefox, which will automatically download and install the latest version, or by visiting https://www.mozilla.org/en-US/firefox/new/. For enterprise deployments, administrators should enforce Firefox version 149 or later via group policy or mobile device management solutions. Until patching is completed, users can reduce exposure by avoiding interaction with untrusted XML files and by disabling JavaScript in high-risk browsing contexts if feasible. The official Mozilla security advisory at https://www.mozilla.org/security/advisories/mfsa2026-20/ and the related bug report at https://bugzilla.mozilla.org/show_bug.cgi?id=1955311 provide additional technical details and confirmation of the fix.

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Same weakness CWE-400 – Uncontrolled Resource Consumption

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Same technique Denial Of Service

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Vendor StatusVendor

Debian

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

SUSE

Severity: High
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Fixed

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EUVD-2026-14867 vulnerability details – vuln.today
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