Security Advisory

CVE-2026-40684

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2026-04-30 00:00:00

Last updated 2026-05-01 17:22:32

Assigner mitre

State PUBLISHED

Description

In Exim before 4.99.2, on systems using musl libc (not glibc), an attacker can crash the connection instance when malformed DNS data is present in PTR records. This is caused by a dn_expand oddity in octal printing.

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