VULNERABILITY INTELLIGENCE

CVE-2018-14647

CVSS score7.5 HIGH
EPSS probability10.91%
CISA KEVNot currently listed
Published2018-09-25
Last modified2026-10-07
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Description

Python's elementtree C accelerator failed to initialise Expat's hash salt during initialization. This could make it easy to conduct denial of service attacks against Expat by constructing an XML document that would cause pathological hash collisions in Expat's internal data structures, consuming large amounts CPU and RAM. The vulnerability exists in Python versions 3.7.0, 3.6.0 through 3.6.6, 3.5.0 through 3.5.6, 3.4.0 through 3.4.9, 2.7.0 through 2.7.15.

Weakness classification

  • CWE-335: Incorrect Usage of Seeds in Pseudo-Random Number Generator (PRNG)
  • CWE-665: Improper Initialization
  • CWE-909: Missing Initialization of Resource

Primary references