https://seclists.org/oss-sec/2026/q2/728: CVE-2026-48840: Exim 4.99.4: PROXY-protocol uninitialised-stack information disclosu

Published May 29, 2026
·
Updated

Affected Software

1 affected component
Exim Exim>=4.88<=4.99.3
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Frequently Asked Questions

1

What is CVE-2026-48840?

CVE-2026-48840 is a pre-authentication information disclosure vulnerability affecting Exim versions 4.88 through 4.99.3.

2

What is the severity of CVE-2026-48840?

The severity of CVE-2026-48840 is considered critical due to its potential to leak sensitive information.

3

How do I fix CVE-2026-48840?

To fix CVE-2026-48840, upgrade Exim to version 4.99.4 or later.

4

Which versions of Exim are affected by CVE-2026-48840?

CVE-2026-48840 affects Exim versions from 4.88 to 4.99.3.

5

When was CVE-2026-48840 published?

CVE-2026-48840 was published on May 29, 2026.

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