SB2026043088 - Multiple vulnerabilities in Mozilla Thunderbird

Description

This security bulletin contains information about 4 secuirty vulnerabilities.

1) Out-of-bounds read (CVE-ID: CVE-2026-7320)

The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to incorrect boundary conditions in the Audio/Video component when processing media content. A remote attacker can cause the browser to process specially crafted media content to disclose sensitive information.

2) Buffer overflow (CVE-ID: CVE-2026-7322)

The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to memory corruption when processing crafted web content. A remote attacker can trigger memory safety bugs to execute arbitrary code.

3) Buffer overflow (CVE-ID: CVE-2026-7323)

The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to memory corruption when rendering web content. A remote attacker can trigger memory corruption using specially crafted web content to execute arbitrary code.

4) Buffer overflow (CVE-ID: CVE-2026-7324)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when processing HTML content. A remote attacker can trick the victim into visiting a specially crafted website, trigger memory corruption and execute arbitrary code on the target system.

Remediation

Install update from vendor's website.

References

• https://www.mozilla.org/en-US/security/advisories/mfsa2026-38/
• https://www.mozilla.org/en-US/security/advisories/mfsa2026-39/