CVE-2026-48840

5.3 MEDIUM

Published: May 30, 2026 Modified: June 05, 2026

Description

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.

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

CVSS v3.x Details

0.0 Low Medium High Critical 10.0

Vector String

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory

https://exim.org/static/doc/security/EXIM-Security-2026-05-19.1

Source: cve@mitre.org

Vendor Advisory

https://www.openwall.com/lists/oss-security/2026/05/29/3

Source: cve@mitre.org

Mailing List Mitigation Third Party Advisory

http://www.openwall.com/lists/oss-security/2026/05/29/3

Source: af854a3a-2127-422b-91ae-364da2661108

Mailing List Mitigation Third Party Advisory

https://lists.debian.org/debian-lts-announce/2026/06/msg00004.html

Source: af854a3a-2127-422b-91ae-364da2661108

4 reference(s) from NVD

Quick Stats

CVSS v3 Score

5.3 / 10.0

EPSS (Exploit Probability)

0.3%

19th percentile

Exploitation Status

Not in CISA KEV

Weaknesses (CWE)

CWE-839

Affected Vendors

exim

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