{"id":"UBUNTU-CVE-2026-94184","details":"A stack-based buffer overflow flaw was found in fetchmail when built with NTLM support. A malicious or compromised mail server advertising NTLM authentication can send a crafted Type 2 challenge that causes fetchmail to write past a fixed stack buffer while building the NTLM authenticate response. This may lead to remote code execution depending on stack-frame layout, or to authentication failure or process termination under memory hardening. Affects v5.0.8 through v6.6.6.","modified":"2026-09-24T02:03:13.160721879Z","published":"2026-09-21T15:17:00Z","upstream":["CVE-2026-94184"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-94184"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-94184"},{"type":"REPORT","url":"https://www.fetchmail.info/fetchmail-SA-2026-01.txt"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-94184"},{"type":"REPORT","url":"https://www.openwall.com/lists/oss-security/2026/06/27/8"}],"affected":[{"package":{"name":"fetchmail","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/fetchmail?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.3.26-1","6.3.26-2"],"ecosystem_specific":{"binaries":[{"binary_name":"fetchmail","binary_version":"6.3.26-2"},{"binary_name":"fetchmailconf","binary_version":"6.3.26-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-94184.json"}},{"package":{"name":"fetchmail","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/fetchmail?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.3.26-3","6.3.26-3build1","6.3.26-3ubuntu0.1~18.04.1"],"ecosystem_specific":{"binaries":[{"binary_version":"6.3.26-3ubuntu0.1~18.04.1","binary_name":"fetchmail"},{"binary_name":"fetchmailconf","binary_version":"6.3.26-3ubuntu0.1~18.04.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-94184.json"}},{"package":{"name":"fetchmail","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/fetchmail?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.4.0~rc4-1ubuntu1","6.4.1-1ubuntu1","6.4.2-2"],"ecosystem_specific":{"binaries":[{"binary_name":"fetchmail","binary_version":"6.4.2-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-94184.json"}},{"package":{"name":"fetchmail","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/fetchmail?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.4.22-1","6.4.23-1","6.4.24-1","6.4.25-1","6.4.26-1","6.4.27-1","6.4.27-1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_version":"6.4.27-1ubuntu0.1","binary_name":"fetchmail"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-94184.json"}},{"package":{"name":"fetchmail","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/fetchmail?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.4.37-1","6.4.38-1ubuntu1","6.4.38-1ubuntu3","6.4.38-1ubuntu4","6.4.38-1ubuntu4.1"],"ecosystem_specific":{"binaries":[{"binary_name":"fetchmail","binary_version":"6.4.38-1ubuntu4.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-94184.json"}},{"package":{"name":"fetchmail","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/fetchmail?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.5.4-0ubuntu2","6.5.4-0ubuntu3","6.6.2-2"],"ecosystem_specific":{"binaries":[{"binary_name":"fetchmail","binary_version":"6.6.2-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-94184.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}