Exim 4.88 before 4.99.4, in some proxy configurations, mishandles certain short payloads, leading to disclosure of uninitialized stack memory values to a client.Referenceshttps://exim.org/static/doc/security/EXIM-Security-2026-05-19.1https://www.openwall.com/lists/oss-security/2026/05/29/3
