CVE-2026-40684

HighCVSS 7.5/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-684

Affected software

No affected versions have been published.

Timeline

Published: Apr 30, 2026
Last modified: Jun 17, 2026
NVD status: Modified

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