CVE-2026-40684
MEDIUM
NVD
CVSS Score
5.9
Severity
MEDIUM
Published
Apr 30, 2026
Vendor
unknown
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.