Packages
- exim4 - Exim is a mail transport agent
Details
It was discovered that Exim had an out-of-bounds write when
Proxy-Protocol was used with an attacker-controlled proxy. A remote
attacker could possibly use this issue to execute arbitrary code.
(CVE-2026-94054)
It was discovered that Exim had a use-after-free when certain
non-default TLS settings were used with GnuTLS. A remote attacker
could possibly use this issue to cause Exim to crash, resulting in
a denial of service. This issue only affected Ubuntu 26.04 LTS.
(CVE-2026-94055)
It was discovered that Exim allowed attackers to read uninitialized
data from stack memory when Proxy-Protocol was used with an
attacker-controlled proxy. A remote attacker could possibly use this
issue to obtain sensitive information. (CVE-2026-94056)
It was discovered that Exim allowed SMTP smuggling via crafted...
It was discovered that Exim had an out-of-bounds write when
Proxy-Protocol was used with an attacker-controlled proxy. A remote
attacker could possibly use this issue to execute arbitrary code.
(CVE-2026-94054)
It was discovered that Exim had a use-after-free when certain
non-default TLS settings were used with GnuTLS. A remote attacker
could possibly use this issue to cause Exim to crash, resulting in
a denial of service. This issue only affected Ubuntu 26.04 LTS.
(CVE-2026-94055)
It was discovered that Exim allowed attackers to read uninitialized
data from stack memory when Proxy-Protocol was used with an
attacker-controlled proxy. A remote attacker could possibly use this
issue to obtain sensitive information. (CVE-2026-94056)
It was discovered that Exim allowed SMTP smuggling via crafted data
sent after a rejection during DATA processing. A remote attacker
could possibly use this issue to inject arbitrary email messages.
(CVE-2026-94057)
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 | ||
|---|---|---|---|
| 26.04 LTS resolute | exim4 – 4.99.1-1ubuntu1.5 | ||
| 24.04 LTS noble | exim4 – 4.97-4ubuntu4.8 | ||
| 22.04 LTS jammy | exim4 – 4.95-4ubuntu2.12 | ||
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