CVE-2026-40685
MEDIUM
NVD
CVSS Score
6.5
Severity
MEDIUM
Published
Apr 30, 2026
Vendor
unknown
Description
In Exim before 4.99.2, when JSON lookup is enabled, an out-of-bounds heap write can occur when a JSON operator encounters malformed JSON in an untrusted header, because of an incorrect implementation of \ skipping.