Vulnerability DatabaseCVE-2018-14647
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CVE-2018-14647
Published:September 25, 2018
Updated:May 17, 2026
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.
Related Resources (20)
https://access.redhat.com/errata/RHSA-2019:3725
https://people.canonical.com/~ubuntu-security/cve/CVE-2018-14647
https://access.redhat.com/errata/RHSA-2019:1260
http://www.securityfocus.com/bid/105396
https://usn.ubuntu.com/3817-1/
http://www.securitytracker.com/id/1041740
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html
https://access.redhat.com/security/cve/CVE-2018-14647
https://www.debian.org/security/2018/dsa-4306
https://bugzilla.redhat.com/show_bug.cgi?id=1632095
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RBJCB2HWOJLP3L7CUQHJHNBHLSVOXJE5/
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14647
https://access.redhat.com/errata/RHSA-2019:2030
https://lists.debian.org/debian-lts-announce/2019/06/msg00023.html
https://bugs.python.org/issue34623
https://usn.ubuntu.com/3817-2/
https://lists.debian.org/debian-lts-announce/2019/06/msg00022.html
https://www.debian.org/security/2018/dsa-4307
https://security-tracker.debian.org/tracker/CVE-2018-14647
https://lists.apache.org/thread.html/r1b103833cb5bc8466e24ff0ecc5e75b45a705334ab6a444e64e840a0%40%3Cissues.bookkeeper.apache.org%3E
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CVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Weakness Type (CWE)
Missing Initialization of Resource
CWE-909
Incorrect Usage of Seeds in Pseudo-Random Number Generator (PRNG)
CWE-335
Improper Initialization
CWE-665
EPSS
Base Score:
1.25