Tor before 0.4.9.7 has an out-of-bounds read when an END, a TRUNCATE, or a TRUNCATED cell lacks a reason in its payload, aka TROVE-2026-011.
https://www.openwall.com/lists/oss-security/2026/05/06/8
https://gitlab.torproject.org/tpo/core/tor/-/work_items/41254
https://gitlab.torproject.org/tpo/core/tor/-/commit/8f98054b1982d00a14639864d03e9afd90b87481
https://forum.torproject.org/c/news/tor-release-announcement/28