An issue was discovered in XListExtensions in ListExt.c in libX11 through 1.6.5. A malicious server can send a reply in which the first string overflows, causing a variable to be set to NULL that will be freed later on, leading to DoS (segmentation fault).
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"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-14598.json"