Resource exhaustion in Mozilla Firefox and Firefox for Android - CVE-2026-4727
Published: March 24, 2026
Vulnerability identifier: #VU124332
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-4727
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper handling of cryptographic operations in the Libraries component in NSS. A remote attacker can trick the victim into visiting a specially crafted website to cause a denial of service.
Affected software
Mozilla Firefox
Firefox for Android
Fedora
Mozilla Thunderbird
firefox
Firefox for Android
Fedora
Mozilla Thunderbird
firefox
How to mitigate CVE-2026-4727
Install security update from vendor's website.
Mozilla Firefox - update to 149.0
Firefox for Android - update to 149.0
Mozilla Thunderbird - update to 149.0
firefox - update to 149.0-4.fc42
Firefox for Android - update to 149.0
Mozilla Thunderbird - update to 149.0
firefox - update to 149.0-4.fc42