Out-of-bounds Read Affecting exim4 package, versions <4.95-4ubuntu2.7


Severity

Recommended
0.0
medium
0
10

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.07% (21st percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications

Snyk Learn

Learn about Out-of-bounds Read vulnerabilities in an interactive lesson.

Start learning
  • Snyk IDSNYK-UBUNTU2204-EXIM4-16338066
  • published4 May 2026
  • disclosed30 Apr 2026

Introduced: 30 Apr 2026

NewCVE-2026-40686  (opens in a new tab)
CWE-125  (opens in a new tab)

How to fix?

Upgrade Ubuntu:22.04 exim4 to version 4.95-4ubuntu2.7 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream exim4 package and not the exim4 package as distributed by Ubuntu. See How to fix? for Ubuntu:22.04 relevant fixed versions and status.

In Exim before 4.99.2, when utf8 operators are enabled, there is an out-of-bounds read if large UTF-8 trailing characters are present (malformed UTF-8 header data). Information might be divulged within an error message produced during handling of an unrelated e-mail message.

CVSS Base Scores

version 3.1