Important: thunderbird security update

Mozilla Thunderbird is a standalone mail and newsgroup client.

This update upgrades Thunderbird to version 115.6.0.

Security Fix(es):

• Mozilla: Heap-buffer-overflow affecting WebGL <code>DrawElementsInstanced</code> method with Mesa VM driver (CVE-2023-6856)
• Mozilla: Memory safety bugs fixed in Firefox 121, Firefox ESR 115.6, and Thunderbird 115.6 (CVE-2023-6864)
• Mozilla: S/MIME signature accepted despite mismatching message date (CVE-2023-50761)
• Mozilla: Truncated signed text was shown with a valid OpenPGP signature (CVE-2023-50762)
• Mozilla: Symlinks may resolve to smaller than expected buffers (CVE-2023-6857)
• Mozilla: Heap buffer overflow in <code>nsTextFragment</code> (CVE-2023-6858)
• Mozilla: Use-after-free in PR_GetIdentitiesLayer (CVE-2023-6859)
• Mozilla: Potential sandbox escape due to <code>VideoBridge</code> lack of texture validation (CVE-2023-6860)
• Mozilla: Heap buffer overflow affected <code>nsWindow::PickerOpen(void)</code> in headless mode (CVE-2023-6861)
• Mozilla: Use-after-free in <code>nsDNSService</code> (CVE-2023-6862)
• Mozilla: Undefined behavior in <code>ShutdownObserver()</code> (CVE-2023-6863)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.