CVE-2010-3493: Multiple race conditions in smtpd.py in the smtpd module in Python 2.6, 2.7, 3.1, and 3.2 alpha allow remot...

Security readout for executives and security teams

CVE-2010-3493 is a denial-of-service flaw in Python's smtpd.py module. A remote party could disrupt a daemon by causing race-condition edge cases during TCP connection handling. The sources do not provide a CVSS score or confirm active exploitation. Exposure is most likely where legacy Python smtpd.py-based SMTP daemons are reachable over a network. Systems only containing Python but not running services using smtpd.py are less likely exposed. The bundle does not identify specific downstream applications beyond Python versions and vendor advisories. Treat this as a legacy exposure and availability risk. It is not sourced as actively exploited, but internet-facing smtpd.py daemons on affected Python versions should be identified and updated or isolated during normal vulnerability remediation cycles. Mitigation focus: Inventory services using Python smtpd.py in Python 2.6, 2.7, 3.1, or 3.2 alpha.; Apply relevant Python or operating-system vendor updates from trusted channels.; If patch status is unclear, check current vendor guidance for affected distributions..

Prepared

Jun 28, 2026, 01:40 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.