CVE-2026-40684

High

Open

TLP:CLEAR

NVD CVE.org

Critical Infrastructure

AI Analysis

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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

CVSS Score: 7.5
EPSS Score ⓘ: 0.36%

29.3th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Confidence: 90%
Published: Apr 30, 2026

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