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Vulnerability · Published May 7, 2026 · Assigned by mozilla

CVE-2026-8092Memory safety bugs fixed in Thunderbird ESR 140.10.2 and Thunderbird 150.0.2

High 8.1

In plain English

A high-severity out-of-bounds read 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 0.4% (higher than 36% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.1High
Exploit odds (30 days)0.4%top 64.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Memory safety bugs present in Thunderbird ESR 140.10.1 and Thunderbird 150.0.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. 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-2026-8092
Debian:13firefox-esr140.10.2esr-1~deb13u1DEBIAN-CVE-2026-8092
Debian:14firefox-esr140.10.2esr-1DEBIAN-CVE-2026-8092
Debian:12thunderbird1:140.10.2esr-1~deb12u1DEBIAN-CVE-2026-8092
Debian:13thunderbird1:140.10.2esr-1~deb13u1DEBIAN-CVE-2026-8092
Debian:14thunderbird1:140.10.2esr-1DEBIAN-CVE-2026-8092
Rocky Linux:10firefox0:140.10.2-1.el10_2RLSA-2026:19160
Ubuntu:22.04:LTSmozjs102no fix listedUBUNTU-CVE-2026-8092
Ubuntu:24.04:LTSmozjs102no fix listedUBUNTU-CVE-2026-8092
Ubuntu:24.04:LTSmozjs115no fix listedUBUNTU-CVE-2026-8092
Ubuntu:22.04:LTSmozjs78no fix listedUBUNTU-CVE-2026-8092
Ubuntu:22.04:LTSmozjs91no fix listedUBUNTU-CVE-2026-8092
Ubuntu:22.04:LTSthunderbirdno fix listedUBUNTU-CVE-2026-8092

Affected products (as reported)

VendorProductVersions
Mozilla Firefox see references
Mozilla Thunderbird see references

Weakness: CWE-125, CWE-787, CWE-416 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

References