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Vulnerability · Published May 7, 2026 · Assigned by mozilla

CVE-2026-8090Use-after-free in the DOM: Networking component

High 7.3

In plain English

A high-severity use-after-free in Firefox from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.3High
Exploit odds (30 days)0.3%top 75.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10firefox140.10.2-1.el10_2ALSA-2026:19160
AlmaLinux:8firefox140.10.2-1.el8_10.alma.1ALSA-2026:20566
AlmaLinux:9firefox140.10.2-1.el9_8ALSA-2026:20574
AlmaLinux:9firefox-x11140.10.2-1.el9_8ALSA-2026:20574
AlmaLinux:10thunderbird140.11.0-1.el10_2.alma.1ALSA-2026:22325
AlmaLinux:8thunderbird140.11.0-1.el8_10.alma.1ALSA-2026:22643
AlmaLinux:9thunderbird140.11.0-1.el9_8.alma.1ALSA-2026:21381
Debian:12firefox-esr140.10.2esr-1~deb12u1DEBIAN-CVE-2026-8090
Debian:13firefox-esr140.10.2esr-1~deb13u1DEBIAN-CVE-2026-8090
Debian:14firefox-esr140.10.2esr-1DEBIAN-CVE-2026-8090
Debian:12thunderbird1:140.10.2esr-1~deb12u1DEBIAN-CVE-2026-8090
Debian:13thunderbird1:140.10.2esr-1~deb13u1DEBIAN-CVE-2026-8090
Debian:14thunderbird1:140.10.2esr-1DEBIAN-CVE-2026-8090
Rocky Linux:10firefox0:140.10.2-1.el10_2RLSA-2026:19160
Ubuntu:22.04:LTSmozjs102no fix listedUBUNTU-CVE-2026-8090
Ubuntu:24.04:LTSmozjs102no fix listedUBUNTU-CVE-2026-8090
Ubuntu:24.04:LTSmozjs115no fix listedUBUNTU-CVE-2026-8090
Ubuntu:22.04:LTSmozjs78no fix listedUBUNTU-CVE-2026-8090
Ubuntu:22.04:LTSmozjs91no fix listedUBUNTU-CVE-2026-8090
Ubuntu:22.04:LTSthunderbirdno fix listedUBUNTU-CVE-2026-8090

Affected products (as reported)

VendorProductVersions
Mozilla Firefox see references
Mozilla Thunderbird see references

Weakness: CWE-416, CWE-825 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

References