CVE-2026-48840 PUBLISHED

Assigner: mitre
Reserved: 25.05.2026 Published: 30.05.2026 Updated: 30.05.2026

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.

Metrics

CVSS 3.1

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

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	Low
Privileges Required	None	Integrity Impact	None
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	Exim
Product	Exim
Versions	Default: unaffected affected from 4.88 to 4.99.4 (excl.)

References

https://exim.org/static/doc/security/EXIM-Security-2026-05-19.1
https://www.openwall.com/lists/oss-security/2026/05/29/3

Problem Types

CWE-839 Numeric Range Comparison Without Minimum Check CWE