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.
References (5)
Scores
CVSS v3
6.5
EPSS
0.0005
EPSS Percentile
14.8%
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-684
Status
published
Products (1)
Exim/Exim
< 4.99.2
Published
Apr 30, 2026
Tracked Since
May 01, 2026