VDB-407989 · CVE-2026-94057 · Nessus 348346

Exim up to 4.100.0 Data Processing crlf injection

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.6	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Exim up to 4.100.0. Affected is an unknown function of the component Data Processing. This manipulation causes input validation. The identification of this vulnerability is CVE-2026-94057. It is possible to initiate the attack remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in Exim up to 4.100.0. Affected by this vulnerability is an unknown functionality of the component Data Processing. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-93. The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs. As an impact it is known to affect integrity. The summary by CVE is:

Exim before 4.100.1 allows SMTP smuggling in which the received message does not match any sent message, and instead depends on crafted data sent after a rejection during DATA processing.

The advisory is shared at lists.exim.org. This vulnerability is known as CVE-2026-94057 since 09/20/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 348346 (Linux Distros Unpatched Vulnerability : CVE-2026-94057), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.100.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (348346). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Mail Server Software

Name

Exim

Version

4.100

License

open-source

CPE 2.3info

🔒

CPE 2.2info

🔒

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.7
VulDB Meta Temp Score: 4.6

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 4.0
CNA Vector (MITRE): 🔒

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
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Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Crlf injection
CWE: CWE-93 / CWE-74 / CWE-707
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 348346
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-94057

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Exim 4.100.1

Timelineinfo

09/19/2026 VulDB entry created
09/20/2026 +0 days Advisory disclosed
09/20/2026 +0 days CVE reserved
09/21/2026 +1 days VulDB entry last update

Sourcesinfo

Advisory: lists.exim.org
Status: Confirmed

CVE: CVE-2026-94057 (🔒)
GCVE (CVE): GCVE-0-2026-94057
GCVE (VulDB): GCVE-100-407989

Entryinfo

Created: 09/20/2026 01:19
Updated: 09/21/2026 10:15
Changes: 09/20/2026 01:19 (63), 09/21/2026 04:13 (2), 09/21/2026 10:15 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.