VULNERABILITY INTELLIGENCE

CVE-2026-40684

CVSS score5.9 MEDIUM
EPSS probability0.36%
CISA KEVNot currently listed
Published2026-04-30
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Weakness classification

  • cve@mitre.org: CWE-684

Primary references