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Status published
Unknown
CVE-2018-20843
In libexpat in Expat before 2.2.7, XML input including XML...
Vulnerability Description
In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks).
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
No credits recorded in the NVD database.
References
- https://usn.ubuntu.com/4040-1/
- https://usn.ubuntu.com/4040-2/
- https://www.debian.org/security/2019/dsa-4472
- https://seclists.org/bugtraq/2019/Jun/39
- https://lists.debian.org/debian-lts-announce/2019/06/msg00028.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CEJJSQSG3KSUQY4FPVHZ7ZTT7FORMFVD/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IDAUGEB3TUP6NEKJDBUBZX7N5OAUOOOK/
- http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00039.html
- https://security.gentoo.org/glsa/201911-08
- https://www.oracle.com/security-alerts/cpuapr2020.html
- https://www.oracle.com/security-alerts/cpuoct2020.html
- https://github.com/libexpat/libexpat/issues/186
- https://github.com/libexpat/libexpat/pull/262
- https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6
- https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/Changes
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226
- https://security.netapp.com/advisory/ntap-20190703-0001/
- https://support.f5.com/csp/article/K51011533
- https://www.oracle.com/security-alerts/cpuApr2021.html
- https://www.oracle.com/security-alerts/cpuoct2021.html
- https://www.tenable.com/security/tns-2021-11
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Affected Vendor
libexpat project
View all reports →Affected Software
libexpat, ubuntu linux, debian linux, fedora, leap, hospitality res 3700, http server, outside in technology, nessus
Vulnerable Versions:
0, 12.04, 14.04, 16.04, 18.04, 18.10, 19.04, 8.0, 9.0, 29, 30, 15.0, 15.1, 5.7, 12.1.3.0, 12.2.1.4.0, 8.5.4, 8.5.5
Timeline
Official Publish:
June 24th, 2019
Last Modified:
May 30th, 2025
Added to House:
July 20th, 2026
CVSS Vectors
No vector data available
Weaknesses (CWE)
No CWE data available
MITRE ATT&CK TTPs
No associated TTPs found for this vulnerability.