CVE-2026-4727
Received Received - Intake

Denial-of-Service in NSS Libraries Affecting Firefox

Publication date: 2026-03-24

Last updated on: 2026-04-13

Assigner: Mozilla Corporation

Description
Denial-of-service in the Libraries component in NSS. This vulnerability was fixed in Firefox 149 and Thunderbird 149.

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Meta Information

Published
2026-03-24
Last Modified
2026-04-13
Generated
2026-07-06
AI Q&A
2026-03-24
EPSS Evaluated
2026-07-05
NVD
CVE-2026-4727
EUVD
EUVD-2026-14869

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
mozilla firefox to 149.0 (exc)
mozilla thunderbird to 149.0 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-400 The product does not properly control the allocation and maintenance of a limited resource.

Attack-Flow Graph

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Executive Summary

This vulnerability is a denial-of-service (DoS) issue found in the Libraries component of NSS (Network Security Services). It affects versions of Firefox earlier than 149.

Impact Analysis

The vulnerability can cause a denial-of-service condition, which means it could make the affected Firefox browser unresponsive or crash, disrupting normal use.

Compliance Impact

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Detection Guidance

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Mitigation Strategies

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