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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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade fetchmail | Oct 22, 2026 | Oct 21, 2026 |
| Amazon Linux Ami 2 | — | Upgrade fetchmail-debuginfoUpgrade fetchmail | Oct 19, 2026 | Oct 19, 2026 |
| Amazon_linux_2023 | — | Upgrade fetchmail-debugsourceUpgrade fetchmail-debuginfoUpgrade fetchmail | Oct 13, 2026 | Sep 21, 2026 |
| Freebsd | — | Upgrade fetchmail | Sep 28, 2026 | Sep 26, 2026 |
| Oracle_linux | — | Upgrade fetchmail | Oct 22, 2026 | Sep 21, 2026 |
| Redhat_linux | — | Upgrade fetchmail-debugsourceNo solution existsUpgrade fetchmail-debuginfoUpgrade fetchmail | Sep 23, 2026 | Jun 27, 2026 |
| Rocky_linux | — | Upgrade fetchmail-debugsourceUpgrade fetchmail-debuginfoUpgrade fetchmail | Oct 23, 2026 | Oct 22, 2026 |
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