🛡️ CVE-2026-40684
🟡 CVSS 5.9 — Medium ✅ No Known Exploit CWE-684 NVD
5.9
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity MEDIUM
CVSS Score 5.9
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE CWE-684
Public Exploit ✅ No
Source NVD
Published 2026-04-30
Updated 2026-06-02
Modified 2026-05-01

Affected Packages

Software From version Fixed in
exim 4.99.2

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