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CVE-2026-40685

MEDIUM CVSS: 6.5 Published: 2026-04-30 Modified: 2026-06-17

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.

Affected Platforms

Exim Exim

Weakness Type

CWE-684, CWE-787

References