Mozilla Thunderbird up to 150.0.0 memory corruption

Summaryinfo

A vulnerability, which was classified as critical, has been found in Mozilla Thunderbird up to 150.0.0. This affects an unknown function. This manipulation causes memory corruption. This vulnerability appears as CVE-2026-7322. The attack may be initiated remotely. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Mozilla Thunderbird up to 150.0.0. Affected by this vulnerability is an unknown functionality. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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, Firefox ESR 115.35.1, Thunderbird 150.0.1, and Thunderbird 140.10.1.

It is possible to read the advisory at bugzilla.mozilla.org. This vulnerability is known as CVE-2026-7322 since 04/28/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 07/02/2026).

The vulnerability scanner Nessus provides a plugin with the ID 310922 (Linux Distros Unpatched Vulnerability : CVE-2026-7322), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 150.0.1 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (310922) and CERT Bund (WID-SEC-2026-1296). Be aware that VulDB is the high quality source for vulnerability data.

Affected

• Debian Linux
• Red Hat Enterprise Linux
• SUSE Linux
• IGEL OS
• SUSE openSUSE
• Mozilla Firefox
• Mozilla Firefox ESR
• Mozilla Thunderbird
• Amazon Linux 2
• RESF Rocky Linux
• Oracle Linux

Productinfo

Type

• Mail Client Software

Vendor

• Mozilla

Name

• Thunderbird

Version

• 150.0

License

• open-source

Website

• Vendor: https://www.mozilla.org/

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Be aware that VulDB is the high quality source for vulnerability data.

Discussion