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Vulnerability record · CVE-2018-14600 · published 24 August 2018

CVE-2018-14600: X.org libx11 out-of-bounds write vulnerability

XX.Org · Libx11

An issue was discovered in libX11 through 1.6.5. The function XListExtensions in ListExt.c interprets a variable as signed instead of unsigned, resulting in an out-of-bounds write (of up to 128 bytes), leading to DoS or remote code execution.

9.8 CVSS 3.0 Critical EPSS 9.3% · top 4.8% CWE-787 · Out-of-bounds write
9.8CVSS 3.0 base score, v2 7.5
9.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
22References
17 Jun 2026Last modified by NVD

Description

An issue was discovered in libX11 through 1.6.5. The function XListExtensions in ListExt.c interprets a variable as signed instead of unsigned, resulting in an out-of-bounds write (of up to 128 bytes), leading to DoS or remote code execution.

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

Affected products

3 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=1102068 Issue TrackingPatchThird Party Advisory
https://cgit.freedesktop.org/xorg/lib/libX11/commit/?id=dbf72805fd9d7b1846fe9a11b46f3994bfc27fea PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2018/08/msg00030.html Mailing ListThird Party Advisory
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=1102068 Issue TrackingPatchThird Party Advisory
https://cgit.freedesktop.org/xorg/lib/libX11/commit/?id=dbf72805fd9d7b1846fe9a11b46f3994bfc27fea PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2018/08/msg00030.html Mailing ListThird Party Advisory
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-2018-14600), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.