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Mozilla CVE-2026-4727

| EUVDEUVD-2026-14869 HIGH
Uncontrolled Resource Consumption (CWE-400)
2026-03-24 mozilla GHSA-f58q-fr7j-32m6
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-2026-14869
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 Libraries component in NSS. This vulnerability affects Firefox < 149.

AnalysisAI

Mozilla NSS Libraries contain a denial-of-service vulnerability affecting Firefox versions below 149 that allows unauthenticated remote attackers to crash affected systems without requiring user interaction. The flaw stems from improper resource handling and currently lacks an available patch. Given the high CVSS score of 7.5 and network-based attack vector, this poses significant availability risk to Mozilla Firefox users.

Technical ContextAI

Mozilla NSS is a cryptographic library that provides core security functionality including SSL/TLS protocol implementation, certificate validation, and cryptographic operations. The vulnerability resides in the Libraries component, which handles low-level cryptographic primitives and protocol processing. Firefox (cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*) depends on NSS for all secure communications. While the CWE classification is not specified in available disclosures, the denial-of-service nature suggests potential issues with resource exhaustion, improper input validation, or algorithmic complexity weaknesses in cryptographic operations or TLS handshake processing. The vulnerability is not tied to a specific information disclosure mechanism despite being tagged with that classification, indicating the primary impact is availability rather than confidentiality.

RemediationAI

Firefox users should upgrade to version 149 or later to remediate this vulnerability. The patch is available through Mozilla's standard automatic update mechanism and can be downloaded manually from https://www.mozilla.org/firefox/. Organizations managing Firefox deployments should prioritize this update in their patch management cycle within 30 days. Until patching is feasible, organizations may reduce risk by restricting Firefox users' access to untrusted or high-risk websites; however, because the vulnerability is in the core TLS/Libraries component, a network-level workaround is not practical. System administrators should monitor for Firefox crashes or unresponsiveness in their user base, which may indicate attempted exploitation. For systems running other NSS-dependent applications (Thunderbird, NSS standalone, etc.), check vendor advisories for corresponding patches.

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Same weakness CWE-400 – Uncontrolled Resource Consumption

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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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CVE-2026-4727 vulnerability details – vuln.today
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