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  • Results Type: Overview
  • Keyword (text search): cpe:2.3:a:python:hpack:1.0:*:*:*:*:*:*:*
  • CPE Name Search: true
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Vuln ID Summary CVSS Severity
CVE-2016-6581

A HTTP/2 implementation built using any version of the Python HPACK library between v1.0.0 and v2.2.0 could be targeted for a denial of service attack, specifically a so-called "HPACK Bomb" attack. This attack occurs when an attacker inserts a header field that is exactly the size of the HPACK dynamic header table into the dynamic header table. The attacker can then send a header block that is simply repeated requests to expand that field in the dynamic table. This can lead to a gigantic compression ratio of 4,096 or better, meaning that 16kB of data can decompress to 64MB of data on the target machine.

Published: January 10, 2017; 10:59:00 AM -0500
V3.0: 7.5 HIGH
V2.0: 7.8 HIGH