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Home - Vulnerability NotesPrint
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CERT-In Vulnerability Note CIVN-2026-0242
Remote Code Execution Vulnerability in Exim

Original Issue Date:May 18, 2026

Severity Rating: CRITICAL

Software Affected

  • Exim versions 4.97 through 4.99.2

Overview

A vulnerability has been reported in Exim, which could allow an unauthenticated remote attacker to execute arbitrary code on the targeted system.

Target Audience:
All end-user organizations and individuals using Exim.

Risk Assessment:
High risk of remote code execution.

Impact Assessment:
Potential for memory corruption.

Description

Exim is an open-source Mail Transfer Agent (MTA) designed for Unix-like operating systems that handles email reception, routing, and delivery.

This vulnerability exists in Exim due use-after-free flaw in the BDAT body parsing path. An unauthenticated remote attacker could exploit this vulnerability by sending a TLS close_notify during an active BDAT transfer and subsequently sending an additional clear text byte over the same TCP connection.

Successful exploitation of this vulnerability could allow an unauthenticated remote attacker to execute arbitrary code on the targeted system.

Solution

Apply appropriate updates as mentioned in:
https://www.exim.org/static/doc/security/EXIM-Security-2026-05-01.1/EXIM-Security-2026-05-01.1.txt

Vendor Information

Exim
https://www.exim.org/static/doc/security/EXIM-Security-2026-05-01.1/EXIM-Security-2026-05-01.1.txt

References

Exim
https://www.exim.org/static/doc/security/EXIM-Security-2026-05-01.1/EXIM-Security-2026-05-01.1.txt

The Hacker News
https://thehackernews.com/2026/05/new-exim-bdat-vulnerability-exposes.html

CVE Name
CVE-2026-45185

Disclaimer

The information provided herein is on "as is" basis, without warranty of any kind.

Contact Information

Email: info@cert-in.org.in
Phone: +91-11-22902657

Postal address

Indian Computer Emergency Response Team (CERT-In)
Ministry of Electronics and Information Technology
Government of India
Electronics Niketan
6, CGO Complex, Lodhi Road,
New Delhi - 110 003
India

 
Indian Computer Emergency Response Team - CERT-In, Ministry of Electronics and Information Technology, Government of India.
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