CVE-2026-40684: Exim

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

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.

Affected products

• Exim Exim: before 4.99.2 (fixed in 4.99.2)

Published 2026-04-30. Last modified 2026-06-17.