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 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.
- Published Sep 21, 2026
- CVSS 5.3 medium
- 0.8% chance of exploitation in the next 30 days (EPSS)
- A fix is available