CVE-2018-14647

mediumpriority · track · 34EPSS 0.109 · 96 %ileEUFRRUUS

grimoire priorityP1 · Urgent

Exploitable?

—

no known exploitation

Likely / severe?

10.9% (96th) EPSS

CVSS 5 · medium

Is it mine?

20 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-27

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

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–high · 3.5–7.5

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.05.3mediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · ENISA EU

v3.05.3mediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · secalert@redhat.com USexploitability 3.9 · impact 1.4

v3.13.5lowAV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:Lsecondary · FSTEC (BDU) RU

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-909USprimaryCWE-335USCWE-404USCWE-665US

affected products (20)

Products and version ranges known to be affected.

The Python Project Python≤ 3.8, 3.7, 3.6, 3.5, 3.4, 2.7enisa_euvdEU
Python Software Foundation Python≤ 2.7fstec_bduRU
Python Software Foundation Python3.5 → 3.8fstec_bduRU
ООО «РусБИТех-Астра» Astra Linux Special Edition≤ 1.6 «Смоленск»fstec_bduRU
canonical ubuntu linux= 12.04nvdUScpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:*:*:*:*
canonical ubuntu linux= 14.04nvdUScpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:*:*:*:*
canonical ubuntu linux= 16.04nvdUScpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:*:*:*:*
canonical ubuntu linux= 18.04nvdUScpe:2.3:o:canonical:ubuntu_linux:*:*:*:*:*:*:*:*
debian debian linux= 8.0nvdUScpe:2.3:o:debian:debian_linux:*:*:*:*:*:*:*:*
debian debian linux= 9.0nvdUScpe:2.3:o:debian:debian_linux:*:*:*:*:*:*:*:*
fedoraproject fedora= 30nvdUScpe:2.3:o:fedoraproject:fedora:*:*:*:*:*:*:*:*
opensuse leap= 15.1nvdUScpe:2.3:o:opensuse:leap:*:*:*:*:*:*:*:*
python python2.7.0 → 2.7.15nvdUScpe:2.3:a:python:python:*:*:*:*:*:*:*:*
python python3.4.0 → 3.4.9nvdUScpe:2.3:a:python:python:*:*:*:*:*:*:*:*
python python3.5.0 → 3.5.6nvdUScpe:2.3:a:python:python:*:*:*:*:*:*:*:*
python python3.6.0 → 3.6.6nvdUScpe:2.3:a:python:python:*:*:*:*:*:*:*:*
python python= 3.7.0nvdUScpe:2.3:a:python:python:*:*:*:*:*:*:*:*
redhat enterprise linux desktop= 7.0nvdUScpe:2.3:o:redhat:enterprise_linux_desktop:*:*:*:*:*:*:*:*
redhat enterprise linux server= 7.0nvdUScpe:2.3:o:redhat:enterprise_linux_server:*:*:*:*:*:*:*:*
redhat enterprise linux workstation= 7.0nvdUScpe:2.3:o:redhat:enterprise_linux_workstation:*:*:*:*:*:*:*:*

advisories (2)

Vendor and ecosystem advisories describing this.

CERTFR-2026-AVI-1385Multiples vulnérabilités dans les produits VMwareFrançais2026-10-26vendor · certfrFR
PSF-2018-5_elementree C accelerator doesn't call XML_SetHashSalt()2018-09-25vendor · osvUS
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.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd certfr osv NVD CVE.org MITRE

published 2018-09-25modified 2026-06-17

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+133 more

references (71)

External citations — patches, advisories, analysis.

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