CVE-2026-94056 PUBLISHED

Assigner: mitre
Reserved: 19.09.2026 Published: 19.09.2026 Updated: 19.09.2026

Exim before 4.100.1, when Proxy-Protocol is used with an attacker-controlled proxy, allows attackers to read certain uninitialized data from stack memory.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:L
CVSS Score: 7.5

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

CVSS 3.1

Product Status

Vendor	Exim
Product	Exim
Versions	Default: unaffected affected from 4.83 to 4.100.1 (excl.)

References

https://lists.exim.org/lurker/message/20260918.121220.0f87338e.en.html

Problem Types

CWE-908 Use of Uninitialized Resource CWE