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CVE-2026-4723
CRITICAL9.8
Description
Use-after-free in the JavaScript Engine component. This vulnerability affects Firefox < 149 and Thunderbird < 149.
CVE Details
CVSS v3.1 Score9.8
SeverityCRITICAL
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack VectorNETWORK
ComplexityLOW
Privileges RequiredNONE
User InteractionNONE
Published3/24/2026
Last Modified3/25/2026
Sourcenvd
Honeypot Sightings0
Affected Products
mozilla:firefox
Weaknesses (CWE)
CWE-416CWE-416
References
https://bugzilla.mozilla.org/show_bug.cgi?id=2013573(security@mozilla.org)
https://www.mozilla.org/security/advisories/mfsa2026-20/(security@mozilla.org)
https://www.mozilla.org/security/advisories/mfsa2026-23/(security@mozilla.org)
IOC Correlations
No correlations recorded
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