Packages
- exim4 - Exim is a mail transport agent
Details
Timo Longin discovered that Exim incorrectly handled certain SMTP messages
in PIPELINING/CHUNKING configurations. A remote attacker could possibly use
this issue to perform SMTP smuggling. This issue only affected Ubuntu
14.04 LTS. (CVE-2023-51766)
It was discovered that Exim incorrectly handled certain malformed JSON
data in headers. A remote attacker could possibly use this issue to crash
Exim, resulting in a denial of service, or execute arbitrary code. This
issue only affected Ubuntu 20.04 LTS. (CVE-2026-40685)
It was discovered that Exim incorrectly handled certain malformed UTF-8
headers. A remote attacker could possibly use this issue to obtain
sensitive information. This issue only affected Ubuntu 20.04 LTS.
(CVE-2026-40686)
It was discovered that Exim incorrectly handled certain SPA resources.
A...
Timo Longin discovered that Exim incorrectly handled certain SMTP messages
in PIPELINING/CHUNKING configurations. A remote attacker could possibly use
this issue to perform SMTP smuggling. This issue only affected Ubuntu
14.04 LTS. (CVE-2023-51766)
It was discovered that Exim incorrectly handled certain malformed JSON
data in headers. A remote attacker could possibly use this issue to crash
Exim, resulting in a denial of service, or execute arbitrary code. This
issue only affected Ubuntu 20.04 LTS. (CVE-2026-40685)
It was discovered that Exim incorrectly handled certain malformed UTF-8
headers. A remote attacker could possibly use this issue to obtain
sensitive information. This issue only affected Ubuntu 20.04 LTS.
(CVE-2026-40686)
It was discovered that Exim incorrectly handled certain SPA resources.
A remote attacker could possibly use this issue to crash Exim, resulting in
a denial of service, or obtain sensitive information. This issue only
affected Ubuntu 20.04 LTS. (CVE-2026-40687)
It was discovered that Exim incorrectly handled certain CHUNKING
transfers in some GnuTLS configurations. A remote attacker could possibly
use this issue to crash Exim, resulting in a denial of service, or execute
arbitrary code. This issue only affected Ubuntu 20.04 LTS. (CVE-2026-45185)
Warisjeet Singh discovered that Exim incorrectly handled certain proxy
connections in builds with proxy support enabled. A remote attacker could
possibly use this issue to obtain sensitive information. This issue only
affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS.
(CVE-2026-48840)
Update instructions
In general, a standard system update will make all the necessary changes.
Learn more about how to get the fixes.The problem can be corrected by updating your system to the following package versions:
| Ubuntu Release | Package Version | ||
|---|---|---|---|
| 20.04 LTS focal | exim4 – 4.93-13ubuntu1.12+esm1 | ||
| exim4-base – 4.93-13ubuntu1.12+esm1 | |||
| exim4-daemon-heavy – 4.93-13ubuntu1.12+esm1 | |||
| exim4-daemon-light – 4.93-13ubuntu1.12+esm1 | |||
| exim4-dev – 4.93-13ubuntu1.12+esm1 | |||
| eximon4 – 4.93-13ubuntu1.12+esm1 | |||
| 18.04 LTS bionic | exim4 – 4.90.1-1ubuntu1.10+esm6 | ||
| exim4-base – 4.90.1-1ubuntu1.10+esm6 | |||
| exim4-daemon-heavy – 4.90.1-1ubuntu1.10+esm6 | |||
| exim4-daemon-light – 4.90.1-1ubuntu1.10+esm6 | |||
| exim4-dev – 4.90.1-1ubuntu1.10+esm6 | |||
| eximon4 – 4.90.1-1ubuntu1.10+esm6 | |||
| 16.04 LTS xenial | exim4 – 4.86.2-2ubuntu2.6+esm9 | ||
| exim4-base – 4.86.2-2ubuntu2.6+esm9 | |||
| exim4-daemon-heavy – 4.86.2-2ubuntu2.6+esm9 | |||
| exim4-daemon-light – 4.86.2-2ubuntu2.6+esm9 | |||
| exim4-dev – 4.86.2-2ubuntu2.6+esm9 | |||
| eximon4 – 4.86.2-2ubuntu2.6+esm9 | |||
| 14.04 LTS trusty | exim4 – 4.82-3ubuntu2.4+esm9 | ||
| exim4-base – 4.82-3ubuntu2.4+esm9 | |||
| exim4-daemon-heavy – 4.82-3ubuntu2.4+esm9 | |||
| exim4-daemon-light – 4.82-3ubuntu2.4+esm9 | |||
| exim4-dev – 4.82-3ubuntu2.4+esm9 | |||
| eximon4 – 4.82-3ubuntu2.4+esm9 | |||
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