CVE-2026-40685
Medium · 6.5CVSS
6.5
EPSS
0.6%
Published
Apr 30, 2026
CISA due date
—
The record
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 packages
| Ecosystem | Package | Introduced | Fixed |
|---|
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