CVE-2026-40685

Published Apr 30, 2026

Last updated 7 days ago

Overview

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.
Source
cve@mitre.org
NVD status
Analyzed
Products
exim

Risk scores

CVSS 3.1

Type
Primary
Base score
9.8
Impact score
5.9
Exploitability score
3.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Severity
CRITICAL

Weaknesses

cve@mitre.org
CWE-684
nvd@nist.gov
CWE-787

Social media

Hype score
Not currently trending

Configurations