CVE-2026-94056 | BDVDB-2026-377169 Detail

EximExim

Description#

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.

Impact#

Per CVSS v3.1: confidentiality impact high, integrity impact none, availability impact low. Attack vector: network.

Weaknesses#

CWE-908 Use of Uninitialized Resource

References#

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

Exploit#

No public exploit known

History#

Version 12026-09-19Record published in the CVE List.
Version 22026-09-21Most recent update recorded in the CVE List.

Published

Published: 2026-09-19
Last modified: 2026-09-21

Vendor information

Vendor: Exim
Product: Exim

All Exim vulnerabilities

Score

7.5 High

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 15.0.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Not classified

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
>= 4.83 and < 4.100.1
Fixed
4.100.1

Scoring System

CVSS v4.0

Not available

CVSS v3.1

7.5 High

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

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

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).