exim has 5 CVEs on record between 2025 and 2026. 4 were published in the last 90 days. The busiest recent month was September 2026 with 4. The median CVSS is 7.0 (high). None have a confirmed exploitation report.
CVEs per month
Last 12 months, by publish date
- Exploited share
- 0% vs 1% corpus
- Median CVSS
- 7.0
- Publish → KEV
- —
- Last 90 days
- 4 prev 0
Worst active — by depth score
CVE-2026-94056High· 7.5Exim before 4.100.1, when Proxy-Protocol is used with an attacker-controlled proxy, allows attackers to read certain uninitialized data from stack memory.41CVE-2026-94054High· 7.0Exim before 4.100.1, when Proxy-Protocol is used with an attacker-controlled proxy, has an out-of-bounds write.39CVE-2025-67896High· 7.0Exim before 4.99.1, with certain non-default rate-limit configurations, allows a remote heap-based buffer overflow because database records are cast directly to internal structures without validation.39CVE-2026-94057Medium· 4.0Exim before 4.100.1 allows SMTP smuggling in which the received message does not match any sent message, and instead depends on crafted data sent after a rejection during DATA processing.22CVE-2026-94055Low· 3.7Exim before 4.100.1, when certain non-default TLS settings are used with GnuTLS, has a use-after-free.20
exim vulnerabilities
CVEs affecting exim, newest first. Open any entry for full detail, references, and exploit status.
5 CVEsRSS
CVE-2026-94056High· 7.5Exim before 4.100.1, when Proxy-Protocol is used with an attacker-controlled proxy, allows attackers to read certain uninitialized data from stack memory.
Exim before 4.100.1, when Proxy-Protocol is used with an attacker-controlled proxy, allows attackers to read certain uninitialized data from stack memory.
CVE-2026-94054High· 7.0Exim before 4.100.1, when Proxy-Protocol is used with an attacker-controlled proxy, has an out-of-bounds write.
Exim before 4.100.1, when Proxy-Protocol is used with an attacker-controlled proxy, has an out-of-bounds write.
CVE-2026-94057Medium· 4.0Exim before 4.100.1 allows SMTP smuggling in which the received message does not match any sent message, and instead depends on crafted data sent after a rejection during DATA processing.
Exim before 4.100.1 allows SMTP smuggling in which the received message does not match any sent message, and instead depends on crafted data sent after a rejection during DATA processing.
CVE-2026-94055Low· 3.7Exim before 4.100.1, when certain non-default TLS settings are used with GnuTLS, has a use-after-free.
Exim before 4.100.1, when certain non-default TLS settings are used with GnuTLS, has a use-after-free.
CVE-2025-67896High· 7.0Exim before 4.99.1, with certain non-default rate-limit configurations, allows a remote heap-based buffer overflow because database records are cast directly to internal structures without validation.
Exim before 4.99.1, with certain non-default rate-limit configurations, allows a remote heap-based buffer overflow because database records are cast directly to internal structures without validation.