Multiple security issues were discovered in Thunderbird, which could result in denial of service, the execution of arbitrary code or leaks of encrypted email subjects.
For the oldstable distribution (bullseye), these problems have been fixed in version 1:115.9.0-1~deb11u1.
For the stable distribution (bookworm), these problems have been fixed in version 1:115.9.0-1~deb12u1.
We recommend that you upgrade your thunderbird packages.
Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/