Mozilla Thunderbird is a standalone mail and newsgroup client. This update upgrades Thunderbird to version 115.3.1. Security Fix(es): * firefox: use-after-free in workers (CVE-2023-3600) * Mozilla: Out-of-bounds write in PathOps (CVE-2023-5169) * Mozilla: Use-after-free in Ion Compiler (CVE-2023-5171) * Mozilla: Memory safety bugs fixed in Firefox 118, Firefox ESR 115.3, and Thunderbird 115.3 (CVE-2023-5176) * libvpx: Heap buffer overflow in vp8 encoding in libvpx (CVE-2023-5217) 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.