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CVE-2026-8090

High

Description

Use-after-free in the DOM: Networking component. This vulnerability was fixed in Firefox 150.0.2, Firefox ESR 140.10.2, Firefox ESR 115.35.2, Thunderbird 150.0.2, and Thunderbird 140.10.2.

SeverityHigh
CVSS7.3
Exploit probability—
ProductMozilla Firefox
PublishedMay 7, 2026
First seenMay 7, 2026
Weakness typeCWE-416Use after freeCWE-825CWE-825

How to fix

Update
  • mozilla firefox115.35.2, 150.0.2, 140.10.2 or later
  • mozilla thunderbird140.10.2, 150.0.2 or later
Vendor advisories

Affected products

ProductAffected versionsFixed in
mozilla firefoxv < 115.35.2, v < 150.0.2, 128.0 ≤ v < 140.10.2115.35.2, 150.0.2, 140.10.2
mozilla thunderbirdv < 140.10.2, v < 150.0.2140.10.2, 150.0.2

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