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Vulnerability · Published Apr 28, 2026 · Assigned by mozilla

CVE-2026-7323Memory safety bugs fixed in Thunderbird ESR 140.10.1 and Thunderbird 150.0.1

High 7.3

In plain English

A high-severity memory corruption 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 32% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.3High
Exploit odds (30 days)0.4%top 68.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Memory safety bugs present in Thunderbird ESR 140.10.0 and Thunderbird 150.0.0. 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 150.0.1, Firefox ESR 140.10.1, Thunderbird 150.0.1, and Thunderbird 140.10.1.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10firefox140.10.1-1.el10_2ALSA-2026:19157
AlmaLinux:8firefox140.10.1-1.el8_10.alma.1ALSA-2026:19588
AlmaLinux:9firefox140.10.1-1.el9_8.alma.1ALSA-2026:19370
AlmaLinux:9firefox-x11140.10.1-1.el9_8.alma.1ALSA-2026:19370
AlmaLinux:10thunderbird140.10.1-1.el10_2.alma.1ALSA-2026:19153
AlmaLinux:8thunderbird140.10.1-1.el8_10.alma.1ALSA-2026:20586
AlmaLinux:9thunderbird140.10.1-1.el9_8.alma.1ALSA-2026:19348
Debian:12firefox-esr140.10.1esr-1~deb12u1DEBIAN-CVE-2026-7323
Debian:13firefox-esr140.10.1esr-1~deb13u1DEBIAN-CVE-2026-7323
Debian:14firefox-esr140.10.1esr-1DEBIAN-CVE-2026-7323
Debian:12thunderbird1:140.10.1esr-1~deb12u1DEBIAN-CVE-2026-7323
Debian:13thunderbird1:140.10.1esr-1~deb13u1DEBIAN-CVE-2026-7323
Debian:14thunderbird1:140.10.1esr-1DEBIAN-CVE-2026-7323
Rocky Linux:8firefox0:140.10.1-1.el8_10RLSA-2026:19588
Rocky Linux:9firefox0:140.10.1-1.el9_8RLSA-2026:19370
Rocky Linux:10thunderbird0:140.10.1-1.el10_2RLSA-2026:19153
Rocky Linux:8thunderbird0:140.10.1-1.el8_10RLSA-2026:20586
Rocky Linux:9thunderbird0:140.10.1-1.el9_8RLSA-2026:19348
Ubuntu:22.04:LTSmozjs102no fix listedUBUNTU-CVE-2026-7323
Ubuntu:24.04:LTSmozjs102no fix listedUBUNTU-CVE-2026-7323
Ubuntu:24.04:LTSmozjs115no fix listedUBUNTU-CVE-2026-7323
Ubuntu:22.04:LTSmozjs78no fix listedUBUNTU-CVE-2026-7323
Ubuntu:22.04:LTSmozjs91no fix listedUBUNTU-CVE-2026-7323
Ubuntu:22.04:LTSthunderbirdno fix listedUBUNTU-CVE-2026-7323

Affected products (as reported)

VendorProductVersions
Mozilla Firefox see references
Mozilla Thunderbird see references

Weakness: CWE-119, CWE-787 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

References