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Vulnerability record · CVE-2018-14647 · published 25 September 2018

CVE-2018-14647: Python vulnerability

Python · Python

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.

7.5 CVSS 3.1 High EPSS 11% · top 4.3% CWE-335 · CWE-335CWE-665 · CWE-665
7.5CVSS 3.1 base score, v2 5.0
11%EPSS exploitation probability, 30 days
NoNot in CISA KEV
8Affected product versions listed by NVD
32References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

8 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html Mailing ListThird Party Advisory
http://www.securityfocus.com/bid/105396 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1041740 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2019:1260 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2030 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3725 Third Party Advisory
https://bugs.python.org/issue34623 Issue TrackingPatchVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14647 Issue TrackingThird Party Advisory
https://lists.apache.org/thread.html/r1b103833cb5bc8466e24ff0ecc5e75b45a705334ab6a444e64e840a0%40%3Cissues.bookkeeper.ap
https://lists.debian.org/debian-lts-announce/2019/06/msg00022.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2019/06/msg00023.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RBJCB2HWOJLP3L7CUQHJHNB
https://usn.ubuntu.com/3817-1/ Third Party Advisory
https://usn.ubuntu.com/3817-2/ Third Party Advisory
https://www.debian.org/security/2018/dsa-4306 Third Party Advisory
https://www.debian.org/security/2018/dsa-4307 Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html Mailing ListThird Party Advisory
http://www.securityfocus.com/bid/105396 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1041740 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2019:1260 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2030 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3725 Third Party Advisory
https://bugs.python.org/issue34623 Issue TrackingPatchVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14647 Issue TrackingThird Party Advisory
https://lists.apache.org/thread.html/r1b103833cb5bc8466e24ff0ecc5e75b45a705334ab6a444e64e840a0%40%3Cissues.bookkeeper.ap
https://lists.debian.org/debian-lts-announce/2019/06/msg00022.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2019/06/msg00023.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RBJCB2HWOJLP3L7CUQHJHNB
https://usn.ubuntu.com/3817-1/ Third Party Advisory
https://usn.ubuntu.com/3817-2/ Third Party Advisory
https://www.debian.org/security/2018/dsa-4306 Third Party Advisory
https://www.debian.org/security/2018/dsa-4307 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2018-14647), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.