CVE-2018-14647
At a glance Severity MEDIUM 5.3 EPSS EPSS 10.91 % · percentile 96 (2026-10-27) State PUBLISHED Published 2018-09-25 Updated 2026-10-07 Assigner redhat NVD status Modified 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.
Scores Version Score Vector Scored by CVSS 3.0 MEDIUM 5.3 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L redhat CVSS 3.1 HIGH 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H NVD · nvd@nist.gov (Primary) CVSS 3.0 MEDIUM 5.3 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L NVD · secalert@redhat.com (Secondary) CVSS 2.0 MEDIUM 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P NVD · nvd@nist.gov (Primary)
Weaknesses (CWE)
European references
CERT-FR advisories
Affected configurations (NVD CPE) cpe:2.3:a:python:python:*:*:*:*:*:*:*:* ≥ 2.7.0 ≤ 2.7.15cpe:2.3:a:python:python:*:*:*:*:*:*:*:* ≥ 3.4.0 ≤ 3.4.9cpe:2.3:a:python:python:*:*:*:*:*:*:*:* ≥ 3.5.0 ≤ 3.5.6cpe:2.3:a:python:python:*:*:*:*:*:*:*:* ≥ 3.6.0 ≤ 3.6.6cpe:2.3:a:python:python:3.7.0:*:*:*:*:*:*:*cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*Affected products
References
Sources
