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CVE Vulnerability Details :
CVE-2026-40685
PUBLISHED
More InfoOfficial Page
Assigner-mitre
Assigner Org ID-8254265b-2729-46b6-b9e3-3dfca2d5bfca
View Known Exploited Vulnerability (KEV) details
Published At-30 Apr, 2026 | 00:00
Updated At-01 May, 2026 | 14:26
Rejected At-
▼CVE Numbering Authority (CNA)

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 Products
Vendor
EximExim
Product
Exim
Default Status
unaffected
Versions
Affected
  • From 0 before 4.99.2 (semver)
Problem Types
TypeCWE IDDescription
CWECWE-684CWE-684 Incorrect Provision of Specified Functionality
Type: CWE
CWE ID: CWE-684
Description: CWE-684 Incorrect Provision of Specified Functionality
Metrics
VersionBase scoreBase severityVector
3.16.5MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Version: 3.1
Base score: 6.5
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://www.openwall.com/lists/oss-security/2026/04/30/21
N/A
https://exim.org/static/doc/security/cve-2026-04.1/CVE2026-40685.assessment
N/A
https://code.exim.org/exim/exim/commit/9fdc057e71b87c87a0d3d2288b2810a0efaaba57
N/A
https://exim.org/static/doc/security/CVE-2026-40685.txt
N/A
Hyperlink: https://www.openwall.com/lists/oss-security/2026/04/30/21
Resource: N/A
Hyperlink: https://exim.org/static/doc/security/cve-2026-04.1/CVE2026-40685.assessment
Resource: N/A
Hyperlink: https://code.exim.org/exim/exim/commit/9fdc057e71b87c87a0d3d2288b2810a0efaaba57
Resource: N/A
Hyperlink: https://exim.org/static/doc/security/CVE-2026-40685.txt
Resource: N/A
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Details not found