Vim is a UNIX editor that, prior to version 9.0.2121, has a heap-use-after-free vulnerability. When executing a `:s` command for the very first time and using a sub-replace-special atom inside the substitution part, it is possible that the recursive `:s` call causes free-ing of memory which may later then be accessed by the initial `:s` command. The user must intentionally execute the payload and the whole process is a bit tricky to do since it seems to work only reliably for the very first :s command. It may also cause a crash of Vim. Version 9.0.2121 contains a fix for this issue.

GitHub, Inc. AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:L

GitHub, Inc. CWE-416

GitHub, Inc. https://github.com/gandalf4a/crash_report/blob/main/vim/vim_huaf [No types assigned]

GitHub, Inc. https://github.com/vim/vim/commit/26c11c56888d01e298cd8044caf860f3c26f57bb [No types assigned]

GitHub, Inc. https://github.com/vim/vim/pull/13552 [No types assigned]

GitHub, Inc. https://github.com/vim/vim/security/advisories/GHSA-c8qm-x72m-q53q [No types assigned]