CVE-2026-40685: In Exim before 4.99.2, when JSON lookup is enabled, an out-of-bounds h ...

Severity: Critical

CVSS Score: 9.8

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.