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CVE-2026-40684

MEDIUM CVSS: 5.9 Published: 2026-04-30 Modified: 2026-06-17

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.

Affected Platforms

Exim Exim

Weakness Type

CWE-684

References