CVE-2013-7040: Python 2.7 before 3.4 only uses the last eight bits of the prefix to randomize hash values, which causes it...

Security readout for executives and security teams

This flaw weakens Python hash randomization, making it easier for an attacker to force many hash collisions. In vulnerable applications, crafted input could drive excessive CPU use and cause denial of service. The sources do not show active exploitation or a CVSS score. Exposure is most likely in services running the affected Python versions and processing untrusted input into dictionaries or other hash-table-backed structures. Public-facing parsers, APIs, and web applications are higher concern. Treat as a targeted availability risk, not confirmed widespread exploitation. Prioritize internet-facing legacy Python services and vendor-managed platforms where downtime would affect customers or operations. Mitigation focus: Inventory systems and applications using the affected Python runtime versions.; Check Python and operating system vendor guidance for supported updates or backports.; Prioritize externally reachable applications that process untrusted structured input..

Prepared

Jun 14, 2026, 14:16 UTC (UTC+00:00)

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