CVE-2026-48840

State: Published
Severity: 5.3 Medium
Published: May 30, 2026
Updated: Jun 5, 2026
Reserved: May 25, 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.

Scores

CVSS	Score	Vector	Source
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N	mitre

Weaknesses

CWE-839 Numeric Range Comparison Without Minimum Check

Affected Products

Product	Versions
EximExim	4.88 to before 4.99.4Affected

References

https://exim.org/static/doc/security/EXIM-Security-2026-05-19.1
https://www.openwall.com/lists/oss-security/2026/05/29/3
http://www.openwall.com/lists/oss-security/2026/05/29/3
https://lists.debian.org/debian-lts-announce/2026/06/msg00004.html

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