CVE-2026-94184 Fetchmail: fetchmail: stack-based buffer overflow in ntlm authentication (fetchmail-sa-2026-01)
A stack-based buffer overflow in fetchmail's NTLM authentication allows remote code execution or denial of service via a malicious mail server.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-94184?
CVE-2026-94184 is a medium-severity memory corruption vulnerability in Red Hat Enterprise Linux 10, published on 21 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-121
Which versions are affected by CVE-2026-94184?
Linux distribution packages (24)
fetchmail AlmaLinux:10 | All versions | 6.4.38-3.el10_2.1 |
fetchmail AlmaLinux:8 | All versions | 6.4.24-1.el8_10.1 |
fetchmail AlmaLinux:9 | All versions | 6.4.24-1.el9_8.1 |
fetchmail Rocky Linux:10 | All versions | 0:6.4.38-3.el10_2.1 |
fetchmail Rocky Linux:8 | All versions | 0:6.4.24-1.el8_10.1 |
fetchmail Rocky Linux:9 | All versions | 0:6.4.24-1.el9_8.1 |
fetchmail SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | All versions | 6.4.22-150000.20.32.1 |
fetchmail SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS | All versions | 6.4.22-150000.20.32.1 |
fetchmail SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | All versions | 6.4.22-150000.20.32.1 |
fetchmail SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS | All versions | 6.4.22-150000.20.32.1 |
fetchmail SUSE:Linux Enterprise Module for Basesystem 15 SP7 | All versions | 6.4.22-150600.35.6.1 |
fetchmail SUSE:Linux Enterprise Module for Desktop Applications 15 SP7 | All versions | 6.4.22-150600.35.6.1 |
fetchmail SUSE:Linux Enterprise Server 12 SP5-LTSS | All versions | 6.3.26-13.24.1 |
fetchmail SUSE:Linux Enterprise Server 15 SP4-LTSS | All versions | 6.4.22-150000.20.32.1 |
fetchmail SUSE:Linux Enterprise Server 15 SP5-LTSS | All versions | 6.4.22-150000.20.32.1 |
fetchmail SUSE:Linux Enterprise Server 15 SP6-LTSS | All versions | 6.4.22-150600.35.6.1 |
fetchmail SUSE:Linux Enterprise Server 16.0 | All versions | 6.5.2-160000.4.1 |
fetchmail SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5 | All versions | 6.3.26-13.24.1 |
fetchmail SUSE:Linux Enterprise Server for SAP Applications 15 SP4 | All versions | 6.4.22-150000.20.32.1 |
fetchmail SUSE:Linux Enterprise Server for SAP Applications 15 SP5 | All versions | 6.4.22-150000.20.32.1 |
fetchmail SUSE:Linux Enterprise Server for SAP Applications 15 SP6 | All versions | 6.4.22-150600.35.6.1 |
fetchmail SUSE:Linux Enterprise Server for SAP applications 16.0 | All versions | 6.5.2-160000.4.1 |
fetchmail openSUSE:Leap 16.0 | All versions | 6.5.2-160000.4.1 |
fetchmail openSUSE:Tumbleweed | All versions | 6.6.8-1.1 |
How do I fix CVE-2026-94184?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-94184 being exploited?
There is no known exploitation of CVE-2026-94184 in the wild and no public exploit code.
Sources
Also known as ALSA-2026:85959, ALSA-2026:86981, ALSA-2026:86982, AZL-105066, DEBIAN-CVE-2026-94184, GHSA-5pfw-5pv2-2pc6 and 14 more.