CVE-2018-20843

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).

• CWE-611
• CWE-611

• http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00039.htmlMailing List, Third Party Advisory
• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226Issue Tracking, Third Party Advisory
• https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/ChangesRelease Notes, Third Party Advisory
• https://github.com/libexpat/libexpat/issues/186Issue Tracking, Patch, Third Party Advisory
• https://github.com/libexpat/libexpat/pull/262Exploit, Patch, Third Party Advisory
• https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6Patch, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2019/06/msg00028.htmlMailing List, Third Party Advisory
• 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/
• https://seclists.org/bugtraq/2019/Jun/39Mailing List, Third Party Advisory
• https://security.gentoo.org/glsa/201911-08Third Party Advisory
• https://security.netapp.com/advisory/ntap-20190703-0001/Third Party Advisory
• https://support.f5.com/csp/article/K51011533Third Party Advisory
• https://usn.ubuntu.com/4040-1/Third Party Advisory
• https://usn.ubuntu.com/4040-2/Third Party Advisory
• https://www.debian.org/security/2019/dsa-4472Third Party Advisory
• https://www.oracle.com/security-alerts/cpuApr2021.htmlPatch, Third Party Advisory
• https://www.oracle.com/security-alerts/cpuapr2020.htmlPatch, Third Party Advisory
• https://www.oracle.com/security-alerts/cpuoct2020.htmlPatch, Third Party Advisory
• https://www.oracle.com/security-alerts/cpuoct2021.htmlPatch, Third Party Advisory
• https://www.tenable.com/security/tns-2021-11Third Party Advisory
• http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00039.htmlMailing List, Third Party Advisory
• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226Issue Tracking, Third Party Advisory
• https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/ChangesRelease Notes, Third Party Advisory
• https://github.com/libexpat/libexpat/issues/186Issue Tracking, Patch, Third Party Advisory
• https://github.com/libexpat/libexpat/pull/262Exploit, Patch, Third Party Advisory
• https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6Patch, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2019/06/msg00028.htmlMailing List, Third Party Advisory
• 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/
• https://seclists.org/bugtraq/2019/Jun/39Mailing List, Third Party Advisory
• https://security.gentoo.org/glsa/201911-08Third Party Advisory
• https://security.netapp.com/advisory/ntap-20190703-0001/Third Party Advisory
• https://support.f5.com/csp/article/K51011533Third Party Advisory
• https://usn.ubuntu.com/4040-1/Third Party Advisory
• https://usn.ubuntu.com/4040-2/Third Party Advisory
• https://www.debian.org/security/2019/dsa-4472Third Party Advisory
• https://www.oracle.com/security-alerts/cpuApr2021.htmlPatch, Third Party Advisory
• https://www.oracle.com/security-alerts/cpuapr2020.htmlPatch, Third Party Advisory
• https://www.oracle.com/security-alerts/cpuoct2020.htmlPatch, Third Party Advisory
• https://www.oracle.com/security-alerts/cpuoct2021.htmlPatch, Third Party Advisory
• https://www.tenable.com/security/tns-2021-11Third Party Advisory

Published

Jun 24, 2019

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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