{"id":"CVE-2026-94184","title":"A stack-based buffer overflow flaw was found in fetchmail when built with NTLM support","summary":"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 fixe…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cwe":["CWE-121"],"vendor":"Red Hat","product":"fetchmail","affected":["fetchmail (all versions)","fetchmail (all versions)","fetchmail (all versions)","fetchmail (all versions)","fetchmail (all versions)"],"published":"2026-09-21","updated":"2026-10-01","sourceUpdated":"2026-10-01T18:17:28.863","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-94184","references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-94184","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2531984","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2537395","label":"secalert@redhat.com"},{"url":"https://gitlab.com/fetchmail/fetchmail/-/commit/cb5be5c38471eec19e519ace0bc569176317ea92","label":"secalert@redhat.com"},{"url":"https://www.fetchmail.info/fetchmail-SA-2026-01.txt","label":"secalert@redhat.com"},{"url":"https://www.openwall.com/lists/oss-security/2026/06/27/8","label":"secalert@redhat.com"},{"url":"http://www.openwall.com/lists/oss-security/2026/09/23/1","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-94184.json"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-94184"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-94184"},{"url":"https://access.redhat.com/errata/RHSA-2026:85959","label":"RHSA-2026:85959"},{"url":"https://access.redhat.com/errata/RHSA-2026:86982","label":"RHSA-2026:86982"},{"url":"https://access.redhat.com/errata/RHSA-2026:86981","label":"RHSA-2026:86981"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-22T03:55:50.026928Z"},"epss":0.01195,"epssPercentile":0.67908,"ingestedAt":"2026-09-21T14:38:56.368Z","slug":"CVE-2026-94184","body":"## Overview\n\nA 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-10-01 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-94184.json)","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[{"seq":214554,"id":"CVE-2026-94184","ts":1790881059844,"field":"cvss","old":"8.1","new":"5.3"},{"seq":214553,"id":"CVE-2026-94184","ts":1790881059844,"field":"severity","old":"high","new":"medium"}]}