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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…
Medium5.3EPSS 10.9%
- Published
- Updated
- Reserved
- Assigned by
- redhat
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
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| redhatCNA (assigner) | 3.0 | Medium5.3 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| NVDNVD · Modified | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 10.9% · top 4.1% of all CVEs (4 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.
Weakness
Affected products
- affected 3.8, 3.7, 3.6, 3.5, 3.4, 2.7
References (16)
- DSA-4306 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- USN-3817-2 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- 1041740 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- 105396 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- DSA-4307 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- https://bugs.python.org/issue34623 (opens in a new tab)x_refsource_MISCx_transferred
- USN-3817-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14647 (opens in a new tab)x_refsource_CONFIRMx_transferred
- FEDORA-2019-0c91ce7b3c (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- RHSA-2019:1260 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- [debian-lts-announce] 20190625 [SECURITY] [DLA 1834-1] python2.7 security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- [debian-lts-announce] 20190625 [SECURITY] [DLA 1835-1] python3.4 security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- RHSA-2019:2030 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2019:3725 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- openSUSE-SU-2020:0086 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- [bookkeeper-issues] 20200729 [GitHub] [bookkeeper] padma81 opened a new issue #2387: Security vulnerabilities in the apache/bookkeeper-4.9.2 image (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://trackcve.app/cve/CVE-2018-14647)Record last updated .