{"id":"USN-8834-1","summary":"exim4 vulnerabilities","details":"It was discovered that Exim had an out-of-bounds write when\nProxy-Protocol was used with an attacker-controlled proxy. A remote\nattacker could possibly use this issue to execute arbitrary code.\n(CVE-2026-94054)\n\nIt was discovered that Exim had a use-after-free when certain\nnon-default TLS settings were used with GnuTLS. A remote attacker\ncould possibly use this issue to cause Exim to crash, resulting in\na denial of service. This issue only affected Ubuntu 26.04 LTS.\n(CVE-2026-94055)\n\nIt was discovered that Exim allowed attackers to read uninitialized\ndata from stack memory when Proxy-Protocol was used with an\nattacker-controlled proxy. A remote attacker could possibly use this\nissue to obtain sensitive information. (CVE-2026-94056)\n\nIt was discovered that Exim allowed SMTP smuggling via crafted data\nsent after a rejection during DATA processing. A remote attacker\ncould possibly use this issue to inject arbitrary email messages.\n(CVE-2026-94057)","modified":"2026-09-28T17:42:48.491238070Z","published":"2026-09-28T12:05:13Z","related":["UBUNTU-CVE-2026-94054","UBUNTU-CVE-2026-94055","UBUNTU-CVE-2026-94056","UBUNTU-CVE-2026-94057"],"upstream":["CVE-2026-94054","CVE-2026-94055","CVE-2026-94056","CVE-2026-94057","UBUNTU-CVE-2026-94054","UBUNTU-CVE-2026-94055","UBUNTU-CVE-2026-94056","UBUNTU-CVE-2026-94057"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8834-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-94054"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-94055"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-94056"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-94057"}],"affected":[{"package":{"name":"exim4","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/exim4?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.95-4ubuntu2.12"}]}],"versions":["4.94.2-7ubuntu2","4.95-2ubuntu2","4.95-4ubuntu1","4.95-4ubuntu2","4.95-4ubuntu2.1","4.95-4ubuntu2.2","4.95-4ubuntu2.3","4.95-4ubuntu2.4","4.95-4ubuntu2.5","4.95-4ubuntu2.6","4.95-4ubuntu2.7","4.95-4ubuntu2.8","4.95-4ubuntu2.9","4.95-4ubuntu2.10","4.95-4ubuntu2.11"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"exim4","binary_version":"4.95-4ubuntu2.12"},{"binary_version":"4.95-4ubuntu2.12","binary_name":"exim4-base"},{"binary_name":"exim4-config","binary_version":"4.95-4ubuntu2.12"},{"binary_name":"exim4-daemon-heavy","binary_version":"4.95-4ubuntu2.12"},{"binary_name":"exim4-daemon-light","binary_version":"4.95-4ubuntu2.12"},{"binary_name":"eximon4","binary_version":"4.95-4ubuntu2.12"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8834-1.json","cves_map":{"ecosystem":"Ubuntu:22.04:LTS","cves":[{"id":"CVE-2026-94054","severity":[{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L","type":"CVSS_V3"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2026-94056","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:L"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-94057"}]}}},{"package":{"name":"exim4","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/exim4?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.97-4ubuntu4.8"}]}],"versions":["4.96-17ubuntu2","4.96-17ubuntu2.1","4.97-3ubuntu1","4.97-4ubuntu1","4.97-4ubuntu3","4.97-4ubuntu4","4.97-4ubuntu4.1","4.97-4ubuntu4.2","4.97-4ubuntu4.3","4.97-4ubuntu4.4","4.97-4ubuntu4.5","4.97-4ubuntu4.6","4.97-4ubuntu4.7"],"ecosystem_specific":{"binaries":[{"binary_version":"4.97-4ubuntu4.8","binary_name":"exim4"},{"binary_version":"4.97-4ubuntu4.8","binary_name":"exim4-base"},{"binary_version":"4.97-4ubuntu4.8","binary_name":"exim4-config"},{"binary_version":"4.97-4ubuntu4.8","binary_name":"exim4-daemon-heavy"},{"binary_name":"exim4-daemon-light","binary_version":"4.97-4ubuntu4.8"},{"binary_version":"4.97-4ubuntu4.8","binary_name":"eximon4"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8834-1.json","cves_map":{"ecosystem":"Ubuntu:24.04:LTS","cves":[{"id":"CVE-2026-94054","severity":[{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:L"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-94056"},{"id":"CVE-2026-94057","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]}]}}},{"package":{"name":"exim4","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/exim4?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.99.1-1ubuntu1.5"}]}],"versions":["4.98.2-1ubuntu2","4.99-4ubuntu1","4.99.1-1ubuntu1","4.99.1-1ubuntu1.1","4.99.1-1ubuntu1.2","4.99.1-1ubuntu1.3","4.99.1-1ubuntu1.4"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"exim4","binary_version":"4.99.1-1ubuntu1.5"},{"binary_name":"exim4-base","binary_version":"4.99.1-1ubuntu1.5"},{"binary_name":"exim4-config","binary_version":"4.99.1-1ubuntu1.5"},{"binary_name":"exim4-daemon-heavy","binary_version":"4.99.1-1ubuntu1.5"},{"binary_version":"4.99.1-1ubuntu1.5","binary_name":"exim4-daemon-light"},{"binary_name":"eximon4","binary_version":"4.99.1-1ubuntu1.5"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8834-1.json","cves_map":{"ecosystem":"Ubuntu:26.04:LTS","cves":[{"id":"CVE-2026-94054","severity":[{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2026-94055","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2026-94056","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:L"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-94057"}]}}}],"schema_version":"1.9.0"}