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vulnerability
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CVE-2026-40685
Component Overview
Vulnerability Overview
Name
CVE-2026-40685
Source
NVD (
link
)
Debian (
link
)
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.
CWEs
CWE-684
CWE-787
Published Date
Apr 30, 2026
Updated Date
Jun 17, 2026
Workaround
-
Advisories
https://code.exim.org/exim/exim/commit/9fdc057e71b87c87a0d3d2288b2810a0efaaba57
Patch
https://exim.org/static/doc/security/CVE-2026-40685.txt
Broken Link
https://exim.org/static/doc/security/cve-2026-04.1/CVE2026-40685.assessment
Vendor Advisory
https://www.openwall.com/lists/oss-security/2026/04/30/21
Mailing List
Analysis
#
Affected Component
Analysis
exim
Exploitable
Vulnerability Ratings
#
6.5
CVSSv31
9.8
CVSSv31
NaN
other
Others affected components
#
Name
Project
Project Version
Version
Status
exim
buildroot
2025.02.x
4.99.4
Not Affected
exim
buildroot
master
4.99.4
Not Affected
exim
openwrt
master
4.99.4-r1
Not Affected