Summary
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)
Fixed packages 3
| Release | Package | Fixed in |
|---|---|---|
| Ubuntu · 22.04 LTS 22.04:LTS | exim4 | 4.95-4ubuntu2.12 |
| Ubuntu · 24.04 LTS 24.04:LTS | exim4 | 4.97-4ubuntu4.8 |
| Ubuntu · 26.04 LTS 26.04:LTS | exim4 | 4.99.1-1ubuntu1.5 |
Vulnerabilities 4
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High 7.5
Exim before 4.100.1, when Proxy-Protocol is used with an attacker-controlled proxy, allows attackers to read certain un…
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High 7.0
Exim before 4.100.1, when Proxy-Protocol is used with an attacker-controlled proxy, has an out-of-bounds write.
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Medium 4.0
Exim before 4.100.1 allows SMTP smuggling in which the received message does not match any sent message, and instead de…
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Low 3.7
Exim before 4.100.1, when certain non-default TLS settings are used with GnuTLS, has a use-after-free.