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Vulnerability record · CVE-2018-14598 · published 24 August 2018

CVE-2018-14598: X.org libx11 improper input validation vulnerability

XX.Org · Libx11

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).

7.5 CVSS 3.0 High EPSS 4.2% · top 9.3% CWE-20 · Improper input validation
7.5CVSS 3.0 base score, v2 5.0
4.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
24References
17 Jun 2026Last modified by NVD

Description

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).

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.openwall.com/lists/oss-security/2018/08/21/6 Mailing ListThird Party Advisory
http://www.securityfocus.com/bid/105177 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1041543 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2019:2079
https://bugzilla.suse.com/show_bug.cgi?id=1102073 Issue TrackingPatchThird Party Advisory
https://cgit.freedesktop.org/xorg/lib/libX11/commit/?id=e83722768fd5c467ef61fa159e8c6278770b45c2 PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2018/08/msg00030.html Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YGARUV66TS5OOSLR5A76BUB
https://lists.x.org/archives/xorg-announce/2018-August/002916.html Third Party Advisory
https://security.gentoo.org/glsa/201811-01 Third Party Advisory
https://usn.ubuntu.com/3758-1/ Third Party Advisory
https://usn.ubuntu.com/3758-2/ Third Party Advisory
http://www.openwall.com/lists/oss-security/2018/08/21/6 Mailing ListThird Party Advisory
http://www.securityfocus.com/bid/105177 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1041543 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2019:2079
https://bugzilla.suse.com/show_bug.cgi?id=1102073 Issue TrackingPatchThird Party Advisory
https://cgit.freedesktop.org/xorg/lib/libX11/commit/?id=e83722768fd5c467ef61fa159e8c6278770b45c2 PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2018/08/msg00030.html Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YGARUV66TS5OOSLR5A76BUB
https://lists.x.org/archives/xorg-announce/2018-August/002916.html Third Party Advisory
https://security.gentoo.org/glsa/201811-01 Third Party Advisory
https://usn.ubuntu.com/3758-1/ Third Party Advisory
https://usn.ubuntu.com/3758-2/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2018-14598), CISA KEV, FIRST EPSS (scores of 2026-10-03). This page is refreshed as NVD updates the record.