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sendmail through 8.17.2 allows SMTP smuggling in certain configurations. Remote attackers can use a published exploitation technique to inject e-mail messages with a spoofed MAIL FROM address, allowing bypass of an SPF protection mechanism. This occurs because sendmail supports <LF>.<CR><LF> but some other popular e-mail servers do not. This is resolved in 8.18 and later versions with 'o' in srv_features.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade sendmail-docUpgrade sendmail-debugsourceUpgrade sendmail-milter-debuginfoUpgrade sendmail-milter-develUpgrade sendmailUpgrade sendmail-debuginfoUpgrade sendmail-cfUpgrade sendmail-milter | Jun 9, 2026 | Dec 18, 2023 |
| Debian | — | Upgrade sendmail | Jun 17, 2024 | Dec 24, 2023 |
| Ibm Aix | — | Apply the fix or workaround for sendmail_advisory4 | Apr 12, 2024 | Dec 24, 2023 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Dec 24, 2023 |
| Suse | — | Upgrade sendmailUpgrade libmilter1_0Upgrade sendmail-starttlsUpgrade rmailUpgrade sendmail-develUpgrade libmilter-doc | Mar 5, 2024 | Dec 24, 2023 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 20, 2025 | Dec 24, 2023 |
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