CVE catalog
CVE-2026-94184
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
- Severity
- High · CVSS 8.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 1.20% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | fetchmail | sid | 6.6.9-1 | fixed |
| Debian | fetchmail | forky | 6.6.9-1 | fixed |
| Debian | fetchmail | trixie | 6.4.39-1 | vulnerable |
| Debian | fetchmail | bookworm | 6.4.37-1 | vulnerable |
| Suse | fetchmail | linux enterprise high performance computing 15 sp4-espos | 6.4.22-150000.20.32.1 | fixed |
| Suse | fetchmail | linux enterprise high performance computing 15 sp4-ltss | 6.4.22-150000.20.32.1 | fixed |
| Suse | fetchmail | linux enterprise high performance computing 15 sp5-espos | 6.4.22-150000.20.32.1 | fixed |
| Suse | fetchmail | linux enterprise high performance computing 15 sp5-ltss | 6.4.22-150000.20.32.1 | fixed |
| Suse | fetchmail | linux enterprise server 15 sp4-ltss | 6.4.22-150000.20.32.1 | fixed |
| Suse | fetchmail | linux enterprise server 15 sp5-ltss | 6.4.22-150000.20.32.1 | fixed |
| Suse | fetchmail | linux enterprise server for sap applications 15 sp4 | 6.4.22-150000.20.32.1 | fixed |
| Suse | fetchmail | linux enterprise server for sap applications 15 sp5 | 6.4.22-150000.20.32.1 | fixed |
| Suse | fetchmail | linux enterprise module for basesystem 15 sp7 | 6.4.22-150600.35.6.1 | fixed |
| Suse | fetchmail | linux enterprise module for desktop applications 15 sp7 | 6.4.22-150600.35.6.1 | fixed |
| Suse | fetchmail | linux enterprise server 15 sp6-ltss | 6.4.22-150600.35.6.1 | fixed |
| Suse | fetchmail | linux enterprise server for sap applications 15 sp6 | 6.4.22-150600.35.6.1 | fixed |
| Suse | fetchmail | linux enterprise server 12 sp5-ltss | 6.3.26-13.24.1 | fixed |
| Suse | fetchmail | linux enterprise server ltss extended security 12 sp5 | 6.3.26-13.24.1 | fixed |
| Suse | fetchmail | linux enterprise server 16.0 | 6.5.2-160000.4.1 | fixed |
| Suse | fetchmail | linux enterprise server for sap applications 16.0 | 6.5.2-160000.4.1 | fixed |
| Ubuntu | fetchmail | 16.04 | 6.3.26-1 | vulnerable |
| Ubuntu | fetchmail | 16.04 | 6.3.26-2 | vulnerable |
| Ubuntu | fetchmail | 18.04 | 6.3.26-3 | vulnerable |
| Ubuntu | fetchmail | 18.04 | 6.3.26-3build1 | vulnerable |
| Ubuntu | fetchmail | 18.04 | 6.3.26-3ubuntu0.1~18.04.1 | vulnerable |
| Ubuntu | fetchmail | 20.04 | 6.4.0~rc4-1ubuntu1 | vulnerable |
| Ubuntu | fetchmail | 20.04 | 6.4.1-1ubuntu1 | vulnerable |
| Ubuntu | fetchmail | 20.04 | 6.4.2-2 | vulnerable |
| Ubuntu | fetchmail | 22.04 | 6.4.22-1 | vulnerable |
| Ubuntu | fetchmail | 22.04 | 6.4.23-1 | vulnerable |
| Ubuntu | fetchmail | 22.04 | 6.4.24-1 | vulnerable |
| Ubuntu | fetchmail | 22.04 | 6.4.25-1 | vulnerable |
| Ubuntu | fetchmail | 22.04 | 6.4.26-1 | vulnerable |
| Ubuntu | fetchmail | 22.04 | 6.4.27-1 | vulnerable |
| Ubuntu | fetchmail | 22.04 | 6.4.27-1ubuntu0.1 | vulnerable |
| Ubuntu | fetchmail | 24.04 | 6.4.37-1 | vulnerable |
| Ubuntu | fetchmail | 24.04 | 6.4.38-1ubuntu1 | vulnerable |
| Ubuntu | fetchmail | 24.04 | 6.4.38-1ubuntu3 | vulnerable |
| Ubuntu | fetchmail | 24.04 | 6.4.38-1ubuntu4 | vulnerable |
| Ubuntu | fetchmail | 24.04 | 6.4.38-1ubuntu4.1 | vulnerable |
| Ubuntu | fetchmail | 26.10 | 6.6.2-2 | vulnerable |
| Ubuntu | fetchmail | 26.10 | 6.6.3-3 | vulnerable |
| Ubuntu | fetchmail | 26.10 | 6.6.6-1 | vulnerable |
| Ubuntu | fetchmail | 26.10 | 6.6.6-1build1 | vulnerable |
| Ubuntu | fetchmail | 26.04 | 6.5.4-0ubuntu2 | vulnerable |
| Ubuntu | fetchmail | 26.04 | 6.5.4-0ubuntu3 | vulnerable |
| Ubuntu | fetchmail | 26.04 | 6.6.2-2 | vulnerable |
| Opensuse | fetchmail | leap 16.0 | 6.5.2-160000.4.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | fetchmail | source | sid | 6.6.8-1 | not yet assigned | Not reported | [1148731] |
| Debian | fetchmail | source | forky | 6.6.8-1 | not yet assigned | Not reported | [1148731] |
| Debian | fetchmail | source | trixie | (unfixed) | not yet assigned | Not reported | [1148731] |
| Debian | fetchmail | source | bookworm | (unfixed) | not yet assigned | Not reported | [1148731] |
| Suse | fetchmail | rpm | linux enterprise high performance computing 15 sp4-espos | 6.4.22-150000.20.32.1 | Not reported | SUSE-SU-2026:4605-1 | Not reported |
| Suse | fetchmail | rpm | linux enterprise high performance computing 15 sp4-ltss | 6.4.22-150000.20.32.1 | Not reported | SUSE-SU-2026:4605-1 | Not reported |
| Suse | fetchmail | rpm | linux enterprise high performance computing 15 sp5-espos | 6.4.22-150000.20.32.1 | Not reported | SUSE-SU-2026:4605-1 | Not reported |
| Suse | fetchmail | rpm | linux enterprise high performance computing 15 sp5-ltss | 6.4.22-150000.20.32.1 | Not reported | SUSE-SU-2026:4605-1 | Not reported |
| Suse | fetchmail | rpm | linux enterprise server 15 sp4-ltss | 6.4.22-150000.20.32.1 | Not reported | SUSE-SU-2026:4605-1 | Not reported |
| Suse | fetchmail | rpm | linux enterprise server 15 sp5-ltss | 6.4.22-150000.20.32.1 | Not reported | SUSE-SU-2026:4605-1 | Not reported |
| Suse | fetchmail | rpm | linux enterprise server for sap applications 15 sp4 | 6.4.22-150000.20.32.1 | Not reported | SUSE-SU-2026:4605-1 | Not reported |
| Suse | fetchmail | rpm | linux enterprise server for sap applications 15 sp5 | 6.4.22-150000.20.32.1 | Not reported | SUSE-SU-2026:4605-1 | Not reported |
| Suse | fetchmail | rpm | linux enterprise module for basesystem 15 sp7 | 6.4.22-150600.35.6.1 | Not reported | SUSE-SU-2026:4604-1 | Not reported |
| Suse | fetchmail | rpm | linux enterprise module for desktop applications 15 sp7 | 6.4.22-150600.35.6.1 | Not reported | SUSE-SU-2026:4604-1 | Not reported |
| Suse | fetchmail | rpm | linux enterprise server 15 sp6-ltss | 6.4.22-150600.35.6.1 | Not reported | SUSE-SU-2026:4604-1 | Not reported |
| Suse | fetchmail | rpm | linux enterprise server for sap applications 15 sp6 | 6.4.22-150600.35.6.1 | Not reported | SUSE-SU-2026:4604-1 | Not reported |
| Suse | fetchmail | rpm | linux enterprise server 12 sp5-ltss | 6.3.26-13.24.1 | Not reported | SUSE-SU-2026:4567-1 | Not reported |
| Suse | fetchmail | rpm | linux enterprise server ltss extended security 12 sp5 | 6.3.26-13.24.1 | Not reported | SUSE-SU-2026:4567-1 | Not reported |
| Suse | fetchmail | rpm | linux enterprise server 16.0 | 6.5.2-160000.4.1 | Not reported | SUSE-SU-2026:24221-1 | Not reported |
| Suse | fetchmail | rpm | linux enterprise server for sap applications 16.0 | 6.5.2-160000.4.1 | Not reported | SUSE-SU-2026:24221-1 | Not reported |
| Opensuse | fetchmail | rpm | leap 16.0 | 6.5.2-160000.4.1 | Not reported | OPENSUSE-SU-2026:22077-1 | Not reported |
Notes
[trixie] fetchmail: Minor issue [bookworm] fetchmail: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [fetchmail]Affected
Details (2)
6.4.37-1· amd64 · bookwormAffected
nvd · fetchmail · debian · bookworm; nvd · fetchmail · debian · 12
6.4.37-1· arm64 · bookwormAffected
nvd · fetchmail · debian · bookworm; nvd · fetchmail · debian · 12
[Debian 13 (Trixie)]
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/suse-su-2026_4567-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-94184]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-94184]
- [https://osv.dev/vulnerability/SUSE-SU-2026:24221-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:4567-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:4604-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:4605-1]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-94184]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:22077-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-94184]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-94184.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-3495.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]