CVE-2026-92238: Inconsistent Interpretation of HTTP Requests

A maliciously constructed mail header could lead to multiple fields being parsed as one, or potential memory safety violations. This vulnerability was fixed in Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3...

PT-2026-92474

Name of the Vulnerable Software and Affected Versions Thunderbird versions prior to 140.16 Thunderbird versions prior to 153.3 Thunderbird versions prior to 156 Description A maliciously constructed mail header can cause multiple fields to be parsed as a single field or lead to memory safety...

CVE-2026-92238: Inconsistent Interpretation of HTTP Requests

A maliciously constructed mail header could lead to multiple fields being parsed as one, or potential memory safety violations. This vulnerability was fixed in Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3...

Security Vulnerabilities fixed in Thunderbird 140.16 — Mozilla

A maliciously constructed mail header could lead to multiple fields being parsed as one, or potential memory safety violations. A maliciously constructed IMAP line could cause an out-of-bounds buffer read. A malicious or compromised IMAP server can trigger an out-of-bounds read in the IMAP respon...

Security Vulnerabilities fixed in Thunderbird 156 — Mozilla

A maliciously constructed mail header could lead to multiple fields being parsed as one, or potential memory safety violations. A maliciously constructed IMAP line could cause an out-of-bounds buffer read. A malicious or compromised IMAP server can trigger an out-of-bounds read in the IMAP respon...

Linux Distros Unpatched Vulnerability : CVE-2026-84640

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - A maliciously constructed mail header could lead to a one byte read past the end of a buffer. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.1...

SUSE CVE-2026-84640

A maliciously constructed mail header could lead to a one byte read past the end of a buffer. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2...

EUVD-2026-69709

A maliciously constructed mail header could lead to a one byte read past the end of a buffer. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2...

CVE-2026-84640

A maliciously constructed mail header could lead to a one byte read past the end of a buffer. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2...

DEBIAN-CVE-2026-84640

A maliciously constructed mail header could lead to a one byte read past the end of a buffer. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2...

UBUNTU-CVE-2026-84640

A maliciously constructed mail header could lead to a one byte read past the end of a buffer. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2...

CVE-2026-84640

A maliciously constructed mail header could lead to a one byte read past the end of a buffer. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2...

CVE-2026-84640

A maliciously constructed mail header could lead to a one byte read past the end of a buffer. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2...

CVE-2026-84640 One byte overflow read in mail parser

A maliciously constructed mail header could lead to a one byte read past the end of a buffer. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2...

CVE-2026-84640

A maliciously constructed mail header could lead to a one byte read past the end of a buffer. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2...

CVE-2026-84640

Mozilla Thunderbird is vulnerable to a one-byte read past the end of a buffer caused by a maliciously constructed mail header. This issue is identified as a mail parser vulnerability. The flaw has been remediated in Thunderbird versions 155 , 140.15 , and 153.2 . Specific distribution updates, su...

CVE-2026-40017

A flaw was found in Dovecot. A remote attacker who can send mail to a user can craft a message header designed to cause collisions in an internal hash table. This manipulation forces the IMAP THREAD command to consume excessive CPU resources, leading to degradation or a complete denial of service...

CVE-2026-84640: Buffer Over-read

A maliciously constructed mail header could lead to a one byte read past the end of a buffer. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2...

CVE-2026-84640: Buffer Over-read

A maliciously constructed mail header could lead to a one byte read past the end of a buffer. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2...

PT-2026-84526

Name of the Vulnerable Software and Affected Versions Thunderbird versions prior to 140.15 Thunderbird versions prior to 153.2 Thunderbird versions prior to 155 Description A maliciously constructed mail header can cause a one byte read past the end of a buffer, which is a memory safety issue whe...