CVE-2026-94184
8.1 HIGHPublished 2026-09-21 · Updated 2026-09-23
AI risk analysis
- Summary
- The flaw is a stack-based buffer overflow in fetchmail when built with NTLM support, allowing a malicious mail server to potentially execute arbitrary code.
- Exploitability
- Exploitation requires a compromised or malicious mail server advertising NTLM authentication, making it moderately hard to exploit.
- Blast radius
- If exploited, this could lead to remote code execution on affected systems, potentially compromising the entire system.
- Detection
- No reliable host or network indicator is derivable from the published description.
- Prioritized remediation
- Upgrade to fetchmail v6.6.7 or later.
Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.
NVD 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. Affects v5.0.8 through v6.6.6.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-121
References
- https://access.redhat.com/security/cve/CVE-2026-94184
- https://bugzilla.redhat.com/show_bug.cgi?id=2537395
- https://gitlab.com/fetchmail/fetchmail/-/commit/cb5be5c38471eec19e519ace0bc569176317ea92
- https://www.fetchmail.info/fetchmail-SA-2026-01.txt
- https://www.openwall.com/lists/oss-security/2026/06/27/8
- http://www.openwall.com/lists/oss-security/2026/09/23/1
Data: NVD (public domain). Analysis: local $0 model. Defensive use only.