CVE-2026-94184
Fetchmail: fetchmail: stack-based buffer overflow in ntlm authentication (fetchmail-sa-2026-01)
CVSS Score
5.3
EPSS Score
1.2%
EPSS Percentile
68th
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.
| CWE | CWE-121 |
| Vendor | red hat |
| Product | red hat enterprise linux 10 |
| Published | Sep 21, 2026 |
| Last Updated | Nov 6, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low
Affected Versions
Red Hat / Red Hat Enterprise Linux 10
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 6
All versions affected Red Hat / Red Hat Enterprise Linux 7
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2026:85959 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:86981 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:86982 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-94184 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2531984 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2537395 gitlab.com: https://gitlab.com/fetchmail/fetchmail/-/commit/cb5be5c38471eec19e519ace0bc569176317ea92 fetchmail.info: https://www.fetchmail.info/fetchmail-SA-2026-01.txt openwall.com: https://www.openwall.com/lists/oss-security/2026/06/27/8 openwall.com: http://www.openwall.com/lists/oss-security/2026/09/23/1
Credits
Upstream acknowledges Tristan Madani as the original reporter.