Stack-based Buffer Overflow Affecting fetchmail package, versions <0:6.3.24-7.amzn2.0.3


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.82% (56th percentile)

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  • Snyk IDSNYK-AMZN2-FETCHMAIL-20847445
  • published13 Oct 2026
  • disclosed21 Sept 2026

Introduced: 21 Sep 2026

NewCVE-2026-94184  (opens in a new tab)
CWE-121  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 fetchmail to version 0:6.3.24-7.amzn2.0.3 or higher.
This issue was patched in ALAS2-2026-3981.

NVD Description

Note: Versions mentioned in the description apply only to the upstream fetchmail package and not the fetchmail package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1