CVE-2018-14647
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
02 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
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 10.91% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 95.4% of scored records. A rank, not a probability.
- NVD base score
- 7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-10-07.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2018-09-25 00:00Z8 YR AGO
- Last updated
- 2026-10-07 18:29Z21 DAYS AGO
- Reserved
- 2018-07-27
- Assigning CNA
- redhat
- Record state
- PUBLISHED
- Severity
- Medium (CVSS 5.3)
- CNA CVSS vector
- CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- Weaknesses
- Data version
- 5.2
- Document digest
- 3467dc1f73031a86544846b11c0282aab3329e23f4cebe0790afccc8d386ed34
05 Affected products
06 References
- www.debian.orgDSA-4306https://www.debian.org/security/2018/dsa-4306
- usn.ubuntu.comUSN-3817-2https://usn.ubuntu.com/3817-2/
- www.securitytracker.com1041740http://www.securitytracker.com/id/1041740
- www.securityfocus.com105396http://www.securityfocus.com/bid/105396
- www.debian.orgDSA-4307https://www.debian.org/security/2018/dsa-4307
- bugs.python.orghttps://bugs.python.org/issue34623
- usn.ubuntu.comUSN-3817-1https://usn.ubuntu.com/3817-1/
- bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14647
- lists.fedoraproject.orgFEDORA-2019-0c91ce7b3chttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RBJCB2HWOJLP3L7CUQHJHNBHLSVOXJE5/
- access.redhat.comRHSA-2019:1260https://access.redhat.com/errata/RHSA-2019:1260
- lists.debian.org[debian-lts-announce] 20190625 [SECURITY] [DLA 1834-1] python2.7 security updatehttps://lists.debian.org/debian-lts-announce/2019/06/msg00022.html
- lists.debian.org[debian-lts-announce] 20190625 [SECURITY] [DLA 1835-1] python3.4 security updatehttps://lists.debian.org/debian-lts-announce/2019/06/msg00023.html
- access.redhat.comRHSA-2019:2030https://access.redhat.com/errata/RHSA-2019:2030
- access.redhat.comRHSA-2019:3725https://access.redhat.com/errata/RHSA-2019:3725
- lists.opensuse.orgopenSUSE-SU-2020:0086http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html
- lists.apache.org[bookkeeper-issues] 20200729 [GitHub] [bookkeeper] padma81 opened a new issue #2387: Security vulnerabilities in the apache/bookkeeper-4.9.2 imagehttps://lists.apache.org/thread.html/r1b103833cb5bc8466e24ff0ecc5e75b45a705334ab6a444e64e840a0%40%3Cissues.bookkeeper.apache.org%3E
07 Fixed in
Debian 11
- python2.7 Fixed in 2.7.15-5
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 14.04 LTS
- python2.7 Fixed in 2.7.6-8ubuntu0.5
- python3.4 Fixed in 3.4.3-1ubuntu1~14.04.7
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 16.04 LTS
- python2.7 Fixed in 2.7.12-1ubuntu0~16.04.4
- python3.5 Fixed in 3.5.2-2ubuntu0~16.04.5
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- python2.7 Fixed in 2.7.15~rc1-1ubuntu0.1
- python3.6 Fixed in 3.6.7-1~18.04
- python3.7 Fixed in 3.7.1-1~18.04
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 14.04 LTS
- python3.5 Fixed in 3.5.2-2ubuntu0~16.04.4~14.04.1+esm1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.