HTTP auth prompt tab spoofing — Mozilla

The HTTP authentication prompt appears above the currently open tab regardless of which tab triggered it. A spoofer who could get a user to open a high value target in another tab might be able to capture the user's ID and password. HTTP auth dialogs are visually distinct from the web form logins...

Security Vulnerabilities fixed in Thunderbird 155 — Mozilla

Triggering an error condition in certain MIME bodies would cause uninitialized memory to be used. A maliciously constructed mail header could lead to a one byte read past the end of a buffer. A malicious IMAP server can trigger use-after-free and heap-memory disclosure by sending a crafted ID...

Security Vulnerabilities fixed in Thunderbird 140.15 — Mozilla

Triggering an error condition in certain MIME bodies would cause uninitialized memory to be used. A maliciously constructed mail header could lead to a one byte read past the end of a buffer. A malicious IMAP server can trigger use-after-free and heap-memory disclosure by sending a crafted ID...

Security Vulnerabilities fixed in Firefox ESR 140.17 — Mozilla

Note : We have changed how we publish advisories. We no longer roll all internally identified memory safety vulnerabilities into a single CVE and are now issuing an advisory for every individual bug. CVE-2026-100756: Incorrect boundary conditions in the Audio/Video: Playback component Reporter...

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 153.2 — Mozilla

Triggering an error condition in certain MIME bodies would cause uninitialized memory to be used. A maliciously constructed mail header could lead to a one byte read past the end of a buffer. A malicious IMAP server can trigger use-after-free and heap-memory disclosure by sending a crafted ID...

Security Vulnerabilities fixed in Firefox ESR 115.42 — Mozilla

Note : We have changed how we publish advisories. We no longer roll all internally identified memory safety vulnerabilities into a single CVE and are now issuing an advisory for every individual bug. CVE-2026-100756: Incorrect boundary conditions in the Audio/Video: Playback component Reporter...

Security Vulnerabilities fixed in Thunderbird 157 — Mozilla

An attacker could cause a heap buffer overflow by getting a user to open an email that is greater than or equal to 2GB in size...

Security Vulnerabilities fixed in Thunderbird 140.17 — Mozilla

An attacker could cause a heap buffer overflow by getting a user to open an email that is greater than or equal to 2GB in size...

Security Vulnerabilities fixed in Thunderbird 153.4 — Mozilla

An attacker could cause a heap buffer overflow by getting a user to open an email that is greater than or equal to 2GB in size...