https://www.exim.org/static/doc/security/
https://github.com/ivd38/exim_invalid_free
https://github.com/Exim/exim/compare/exim-4.95...exim-4.96
https://lists.exim.org/lurker/message/20220625.141825.d6de6074.en.html
https://www.openwall.com/lists/oss-security/2022/08/06/1
https://github.com/Exim/exim/wiki/EximSecurity
https://cwe.mitre.org/data/definitions/762.html
https://github.com/Exim/exim/commit/51be321b27825c01829dffd90f11bfff256f7e42
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