CVE-2026-48840

What it is

Exim 4.88 before 4.99.4, in some proxy configurations, mishandles certain short payloads, leading to disclosure of uninitialized stack memory values to a client.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

0.3% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-05-30 02:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-07-22 06:10 UTC Last updatedMost recent change to the record

Details

Published

2026-05-30 02:16 UTC

Last modified

2026-07-22 06:10 UTC

Exploit probability

0.3% · EPSS, next 30 days

Weakness

CWE-839

Record status

Modified

Affected

• Exim < 4.99.4

Attack profile CVSS 3.1 · 5.3

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None