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CVE-2026-40685

nvd nist
Published: Apr 30, 2026Modified: Jun 17, 2026

JSON object

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9.8
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitability: 3.9 / Impact: 5.9
Source: NVD

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 (1)

Products: Exim: Exim
Exim
1 product
Exim
Configuration A
1 vulnerable
Vulnerable SoftwareAffected Versions
Exim
Before 4.99.2

Related CWEs

CWE-684
Incorrect Provision of Specified Functionality
The code does not function according to its published specifications, potentially leading to incorrect usage.
CWE-787
Out-of-bounds Write
The product writes data past the end, or before the beginning, of the intended buffer.

References (4)

Source: cve@mitre.org
Patch
Source: cve@mitre.org
Broken Link
Source: cve@mitre.org
Vendor Advisory
Source: cve@mitre.org
Mailing ListThird Party Advisory

Timeline

No history available yet.