{"id":"CVE-2023-3138","aliases":["ALPINE-CVE-2023-3138","ALSA-2023:6497","ALSA-2023:7029","AZL-27274","BELL-CVE-2023-3138","CLSA-2025-1745270046","CLSA-2026-1792607902","CLSA-2026-1792609205","DEBIAN-CVE-2023-3138","DLA-3472-1","DSA-5433-1","EUVD-2023-43823","GHSA-849h-8wj5-xmx8","JLSEC-2026-472","MGASA-2023-0206","OESA-2023-1376","OESA-2023-1377","OESA-2023-1378","OESA-2023-1392","RHSA-2023:6497","RHSA-2023:7029","RHSA-2024:1088","RHSA-2024:1417","SUSE-SU-2023:2531-1","SUSE-SU-2023:2614-1","UBUNTU-CVE-2023-3138","USN-6168-1","USN-6168-2","openSUSE-SU-2024:13008-1"],"status":"published","title":"A vulnerability was found in libX11. The security flaw occurs because the functions in src...","description":"A vulnerability was found in libX11. The security flaw occurs because the functions in src/InitExt.c in libX11 do not check that the values provided for the Request, Event, or Error IDs are within the bounds of the arrays that those functions write to, using those IDs as array indexes. They trust that they were called with values provided by an Xserver adhering to the bounds specified in the X11 protocol, as all X servers provided by X.Org do. As the protocol only specifies a single byte for these values, an out-of-bounds value provided by a malicious server (or a malicious proxy-in-the-middle) can only overwrite other portions of the Display structure and not write outside the bounds of the Display structure itself, possibly causing the client to crash with this memory corruption.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.01656,"percentile":0.76772,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-119","CWE-787"],"published":"2023-06-15T00:00:00Z","modified":"2026-10-29T11:31:31Z","fixes":[{"ecosystem":"Alpine:v3.15","package":"libx11","fixed_in":["1.7.3.1-r1"],"sources":["osv"]},{"ecosystem":"Alpine:v3.16","package":"libx11","fixed_in":["1.8-r1"],"sources":["osv"]},{"ecosystem":"Alpine:v3.17","package":"libx11","fixed_in":["1.8.4-r1"],"sources":["osv"]},{"ecosystem":"Alpine:v3.18","package":"libx11","fixed_in":["1.8.4-r4"],"sources":["osv"]},{"ecosystem":"AlmaLinux:9","package":"libX11","fixed_in":["1.7.0-8.el9"],"sources":["osv"]},{"ecosystem":"AlmaLinux:9","package":"libX11-common","fixed_in":["1.7.0-8.el9"],"sources":["osv"]},{"ecosystem":"AlmaLinux:9","package":"libX11-devel","fixed_in":["1.7.0-8.el9"],"sources":["osv"]},{"ecosystem":"AlmaLinux:9","package":"libX11-xcb","fixed_in":["1.7.0-8.el9"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"libX11","fixed_in":["1.6.8-6.el8"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"libX11-common","fixed_in":["1.6.8-6.el8"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"libX11-devel","fixed_in":["1.6.8-6.el8"],"sources":["osv"]},{"ecosystem":"AlmaLinux:8","package":"libX11-xcb","fixed_in":["1.6.8-6.el8"],"sources":["osv"]},{"ecosystem":"Azure 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List","Patch","web","article"]},{"url":"https://security.netapp.com/advisory/ntap-20231208-0008/","tags":["x_transferred","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-3138","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-849h-8wj5-xmx8"},{"url":"https://security.alpinelinux.org/vuln/CVE-2023-3138","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2023:6497","tags":["advisory"]},{"url":"https://bugzilla.redhat.com/2213748","tags":["report"]},{"url":"https://errata.almalinux.org/9/ALSA-2023-6497.html","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2023:7029","tags":["advisory"]},{"url":"https://errata.almalinux.org/8/ALSA-2023-7029.html","tags":["advisory"]},{"url":"https://docs.bell-sw.com/security/cves/CVE-2023-3138","tags":["advisory"]},{"url":"https://errata.tuxcare.com/almalinux9.2-esu/CLSA-2025-1745270046.html","tags":["advisory"]},{"url":"https://errata.tuxcare.com/els_os/oraclelinux6els/CLSA-2026-1792607902.html","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-14598","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-14599","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-14600","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-31535","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-43787","tags":["advisory"]},{"url":"https://errata.tuxcare.com/els_os/centos6els/CLSA-2026-1792609205.html","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/3xxx/CVE-2023-3138.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2023-3138","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2023-0206.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=32015","tags":["report"]},{"url":"https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2023-1376","tags":["advisory"]},{"url":"https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2023-1377","tags":["advisory"]},{"url":"https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2023-1378","tags":["advisory"]},{"url":"https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2023-1392","tags":["advisory"]},{"url":"https://access.redhat.com/security/updates/classification/#moderate","tags":["article"]},{"url":"https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html/9.3_release_notes/index","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2213748","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2023/rhsa-2023_6497.json","tags":["advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2023-3138","tags":["advisory","report"]},{"url":"https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.9_release_notes/index","tags":["article"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2023/rhsa-2023_7029.json","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2024:1088","tags":["advisory"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2024/rhsa-2024_1088.json","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2024:1417","tags":["advisory"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2024/rhsa-2024_1417.json","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2023/suse-su-20232531-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1212102","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2023-3138","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2023/suse-su-20232614-1/","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2023-3138","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-6168-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/notices/USN-6168-2","tags":["advisory"]},{"url":"","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2023-3138","description":"A vulnerability was found in libX11. The security flaw occurs because the functions in src/InitExt.c in libX11 do not check that the values provided for the Request, Event, or Error IDs are within the bounds of the arrays that those functions write to, using those IDs as array indexes. They trust that they were called with values provided by an Xserver adhering to the bounds specified in the X11 protocol, as all X servers provided by X.Org do. As the protocol only specifies a single byte for these values, an out-of-bounds value provided by a malicious server (or a malicious proxy-in-the-middle) can only overwrite other portions of the Display structure and not write outside the bounds of the Display structure itself, possibly causing the client to crash with this memory corruption.","status":"published","published":"2023-06-28T00:00:00Z","modified":"2024-08-02T06:48:07.359Z","cwes":["CWE-119"],"updated_at":"2026-11-02T14:35:24.707957Z"}],"euvd":[{"id":"EUVD-2023-43823","description":"A vulnerability was found in libX11. The security flaw occurs because the functions in src/InitExt.c in libX11 do not check that the values provided for the Request, Event, or Error IDs are within the bounds of the arrays that those functions write to, using those IDs as array indexes. They trust that they were called with values provided by an Xserver adhering to the bounds specified in the X11 protocol, as all X servers provided by X.Org do. As the protocol only specifies a single byte for these values, an out-of-bounds value provided by a malicious server (or a malicious proxy-in-the-middle) can only overwrite other portions of the Display structure and not write outside the bounds of the Display structure itself, possibly causing the client to crash with this memory corruption.","status":"published","published":"2023-06-28T00:00:00Z","modified":"2024-08-02T06:48:07Z","updated_at":"2026-11-03T03:50:13.650706Z"}],"ghsa":[{"id":"GHSA-849h-8wj5-xmx8","title":"A vulnerability was found in libX11. The security flaw occurs because the functions in src...","description":"A vulnerability was found in libX11. The security flaw occurs because the functions in src/InitExt.c in libX11 do not check that the values provided for the Request, Event, or Error IDs are within the bounds of the arrays that those functions write to, using those IDs as array indexes. They trust that they were called with values provided by an Xserver adhering to the bounds specified in the X11 protocol, as all X servers provided by X.Org do. As the protocol only specifies a single byte for these values, an out-of-bounds value provided by a malicious server (or a malicious proxy-in-the-middle) can only overwrite other portions of the Display structure and not write outside the bounds of the Display structure itself, possibly causing the client to crash with this memory corruption.","status":"published","published":"2023-06-28T21:30:30Z","modified":"2023-12-08T21:30:29Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-119","CWE-787"],"updated_at":"2026-11-02T14:55:09.695365Z"}],"nvd":[{"id":"CVE-2023-3138","description":"A vulnerability was found in libX11. The security flaw occurs because the functions in src/InitExt.c in libX11 do not check that the values provided for the Request, Event, or Error IDs are within the bounds of the arrays that those functions write to, using those IDs as array indexes. They trust that they were called with values provided by an Xserver adhering to the bounds specified in the X11 protocol, as all X servers provided by X.Org do. As the protocol only specifies a single byte for these values, an out-of-bounds value provided by a malicious server (or a malicious proxy-in-the-middle) can only overwrite other portions of the Display structure and not write outside the bounds of the Display structure itself, possibly causing the client to crash with this memory corruption.","status":"published","published":"2023-06-28T21:15:10.247Z","modified":"2026-06-17T06:13:26.193Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-119","CWE-787"],"updated_at":"2026-11-02T14:08:14.715708Z"}],"osv":[{"id":"ALPINE-CVE-2023-3138","description":"A vulnerability was found in libX11. The security flaw occurs because the functions in src/InitExt.c in libX11 do not check that the values provided for the Request, Event, or Error IDs are within the bounds of the arrays that those functions write to, using those IDs as array indexes. They trust that they were called with values provided by an Xserver adhering to the bounds specified in the X11 protocol, as all X servers provided by X.Org do. As the protocol only specifies a single byte for these values, an out-of-bounds value provided by a malicious server (or a malicious proxy-in-the-middle) can only overwrite other portions of the Display structure and not write outside the bounds of the Display structure itself, possibly causing the client to crash with this memory corruption.","status":"published","published":"2023-06-28T21:15:10.247Z","modified":"2026-10-26T17:17:58.622069732Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:27:49.709457Z"},{"id":"AZL-27274","title":"CVE-2023-3138 affecting package libX11 for versions less than 1.6.12-6","description":"A vulnerability was found in libX11. The security flaw occurs because the functions in src/InitExt.c in libX11 do not check that the values provided for the Request, Event, or Error IDs are within the bounds of the arrays that those functions write to, using those IDs as array indexes. They trust that they were called with values provided by an Xserver adhering to the bounds specified in the X11 protocol, as all X servers provided by X.Org do. As the protocol only specifies a single byte for these values, an out-of-bounds value provided by a malicious server (or a malicious proxy-in-the-middle) can only overwrite other portions of the Display structure and not write outside the bounds of the Display structure itself, possibly causing the client to crash with this memory corruption.","status":"published","published":"2023-06-28T21:15:10Z","modified":"2026-04-21T04:24:11.050931Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:28:03.093433Z"},{"id":"BELL-CVE-2023-3138","title":"CVE-2023-3138 does not affect BellSoft software","status":"withdrawn","published":"2023-08-31T12:21:32.467463Z","modified":"2026-09-04T07:15:08.433258199Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:28:17.742221Z"},{"id":"DEBIAN-CVE-2023-3138","description":"A vulnerability was found in libX11. The security flaw occurs because the functions in src/InitExt.c in libX11 do not check that the values provided for the Request, Event, or Error IDs are within the bounds of the arrays that those functions write to, using those IDs as array indexes. They trust that they were called with values provided by an Xserver adhering to the bounds specified in the X11 protocol, as all X servers provided by X.Org do. As the protocol only specifies a single byte for these values, an out-of-bounds value provided by a malicious server (or a malicious proxy-in-the-middle) can only overwrite other portions of the Display structure and not write outside the bounds of the Display structure itself, possibly causing the client to crash with this memory corruption.","status":"published","published":"2023-06-28T21:15:10.247Z","modified":"2026-10-26T18:00:11.034705039Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:39.679062Z"},{"id":"JLSEC-2026-472","description":"A vulnerability was found in libX11. The security flaw occurs because the functions in `src/InitExt.c` in libX11 do not check that the values provided for the Request, Event, or Error IDs are within the bounds of the arrays that those functions write to, using those IDs as array indexes. They trust that they were called with values provided by an Xserver adhering to the bounds specified in the X11 protocol, as all X servers provided by X.Org do. As the protocol only specifies a single byte for these values, an out-of-bounds value provided by a malicious server (or a malicious proxy-in-the-middle) can only overwrite other portions of the Display structure and not write outside the bounds of the Display structure itself, possibly causing the client to crash with this memory corruption.","status":"published","published":"2026-05-07T17:12:07.051Z","modified":"2026-07-25T18:24:30.231114397Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:47:18.573531Z"},{"id":"OESA-2023-1376","title":"libX11 security update","description":"Core X11 protocol client library.\n\nSecurity Fix(es):\n\nA vulnerability was found in libX11. The security flaw occurs because the functions in src/InitExt.c in libX11 do not check that the values provided for the Request, Event, or Error IDs are within the bounds of the arrays that those functions write to, using those IDs as array indexes. They trust that they were called with values provided by an Xserver adhering to the bounds specified in the X11 protocol, as all X servers provided by X.Org do. As the protocol only specifies a single byte for these values, an out-of-bounds value provided by a malicious server (or a malicious proxy-in-the-middle) can only overwrite other portions of the Display structure and not write outside the bounds of the Display structure itself, possibly causing the client to crash with this memory corruption.(CVE-2023-3138)","status":"published","published":"2023-06-27T11:05:50Z","modified":"2026-08-18T01:17:44.931472989Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L","level":"medium"}],"updated_at":"2026-11-02T15:52:40.328856Z"},{"id":"OESA-2023-1377","title":"libX11 security update","description":"Core X11 protocol client library.\n\nSecurity Fix(es):\n\nA vulnerability was found in libX11. The security flaw occurs because the functions in src/InitExt.c in libX11 do not check that the values provided for the Request, Event, or Error IDs are within the bounds of the arrays that those functions write to, using those IDs as array indexes. They trust that they were called with values provided by an Xserver adhering to the bounds specified in the X11 protocol, as all X servers provided by X.Org do. As the protocol only specifies a single byte for these values, an out-of-bounds value provided by a malicious server (or a malicious proxy-in-the-middle) can only overwrite other portions of the Display structure and not write outside the bounds of the Display structure itself, possibly causing the client to crash with this memory corruption.(CVE-2023-3138)","status":"published","published":"2023-06-27T11:05:50Z","modified":"2026-08-18T01:17:45.054673989Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L","level":"medium"}],"updated_at":"2026-11-02T15:52:40.328856Z"},{"id":"OESA-2023-1378","title":"libX11 security update","description":"Core X11 protocol client library.\n\nSecurity Fix(es):\n\nA vulnerability was found in libX11. The security flaw occurs because the functions in src/InitExt.c in libX11 do not check that the values provided for the Request, Event, or Error IDs are within the bounds of the arrays that those functions write to, using those IDs as array indexes. They trust that they were called with values provided by an Xserver adhering to the bounds specified in the X11 protocol, as all X servers provided by X.Org do. As the protocol only specifies a single byte for these values, an out-of-bounds value provided by a malicious server (or a malicious proxy-in-the-middle) can only overwrite other portions of the Display structure and not write outside the bounds of the Display structure itself, possibly causing the client to crash with this memory corruption.(CVE-2023-3138)","status":"published","published":"2023-06-27T11:05:50Z","modified":"2026-08-18T01:16:58.664641763Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L","level":"medium"}],"updated_at":"2026-11-02T15:52:40.328856Z"},{"id":"OESA-2023-1392","title":"libX11 security update","description":"Core X11 protocol client library.\r\n\r\nSecurity Fix(es):\r\n\r\nA vulnerability was found in libX11. The security flaw occurs because the functions in src/InitExt.c in libX11 do not check that the values provided for the Request, Event, or Error IDs are within the bounds of the arrays that those functions write to, using those IDs as array indexes. They trust that they were called with values provided by an Xserver adhering to the bounds specified in the X11 protocol, as all X servers provided by X.Org do. As the protocol only specifies a single byte for these values, an out-of-bounds value provided by a malicious server (or a malicious proxy-in-the-middle) can only overwrite other portions of the Display structure and not write outside the bounds of the Display structure itself, possibly causing the client to crash with this memory corruption.(CVE-2023-3138)","status":"published","published":"2023-07-01T11:05:51Z","modified":"2026-08-18T01:17:45.167246328Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L","level":"medium"}],"updated_at":"2026-11-02T15:52:40.328856Z"},{"id":"RHSA-2023:6497","title":"Red Hat Security Advisory: libX11 security update","status":"published","published":"2024-09-16T12:25:10Z","modified":"2025-11-22T12:59:10Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:11.734882Z"},{"id":"RHSA-2023:7029","title":"Red Hat Security Advisory: libX11 security update","status":"published","published":"2024-09-16T12:25:19Z","modified":"2025-11-22T13:00:30Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:11.734882Z"},{"id":"RHSA-2024:1088","title":"Red Hat Security Advisory: libX11 security update","status":"published","published":"2024-09-16T12:25:28Z","modified":"2026-03-18T11:34:45.466996Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:12.787505Z"},{"id":"RHSA-2024:1417","title":"Red Hat Security Advisory: libX11 security update","status":"published","published":"2024-09-16T12:25:38Z","modified":"2026-03-18T11:34:49.33491Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:12.787505Z"},{"id":"UBUNTU-CVE-2023-3138","description":"A vulnerability was found in libX11. The security flaw occurs because the functions in src/InitExt.c in libX11 do not check that the values provided for the Request, Event, or Error IDs are within the bounds of the arrays that those functions write to, using those IDs as array indexes. They trust that they were called with values provided by an Xserver adhering to the bounds specified in the X11 protocol, as all X servers provided by X.Org do. As the protocol only specifies a single byte for these values, an out-of-bounds value provided by a malicious server (or a malicious proxy-in-the-middle) can only overwrite other portions of the Display structure and not write outside the bounds of the Display structure itself, possibly causing the client to crash with this memory corruption.","status":"published","published":"2023-06-15T00:00:00Z","modified":"2026-04-22T14:06:35.991865Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T16:54:20.997471Z"},{"id":"ALSA-2023:6497","title":"Moderate: libX11 security update","description":"The libX11 packages contain the core X11 protocol client library.\n\nSecurity Fix(es):\n\n* libX11: InitExt.c can overwrite unintended portions of the Display structure if the extension request leads to a buffer overflow (CVE-2023-3138)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n\nAdditional Changes:\n\nFor detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.","status":"published","published":"2023-11-07T00:00:00Z","modified":"2026-10-29T11:31:31.489234494Z","updated_at":"2026-11-02T15:27:52.091404Z"},{"id":"ALSA-2023:7029","title":"Moderate: libX11 security update","description":"The libX11 packages contain the core X11 protocol client library.\n\nSecurity Fix(es):\n\n* libX11: InitExt.c can overwrite unintended portions of the Display structure if the extension request leads to a buffer overflow (CVE-2023-3138)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n\nAdditional Changes:\n\nFor detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.","status":"published","published":"2023-11-14T00:00:00Z","modified":"2026-10-29T11:02:19.943130325Z","updated_at":"2026-11-02T15:27:52.091404Z"},{"id":"CLSA-2025-1745270046","title":"libX11: Fix of CVE-2023-3138","description":"- CVE-2023-3138: prevent out-of-bounds writes in XQueryExtension responses within\n  Display struct","status":"published","published":"2025-04-21T21:14:11Z","modified":"2026-06-01T00:30:40.260221532Z","updated_at":"2026-11-02T15:43:41.66212Z"},{"id":"CLSA-2026-1792607902","title":"libX11: Fix of 6 CVEs","description":"- CVE-2018-14599: fix off-by-one writes in XListExtensions, XGetFontPath and XListFonts\n- CVE-2018-14600: fix out-of-bounds write in XListExtensions and XGetFontPath\n- CVE-2018-14598: fix crash on invalid reply in XListExtensions and XGetFontPath\n- CVE-2021-31535: reject strings longer than USHRT_MAX before sending them on the wire\n- CVE-2023-3138: add bounds checks for extension request, event and error codes\n- CVE-2023-43787: fix integer overflow in XCreateImage leading to heap overflow","status":"published","published":"2026-10-21T18:38:38Z","modified":"2026-10-26T09:43:55.624481177Z","updated_at":"2026-11-02T15:43:54.672859Z"},{"id":"CLSA-2026-1792609205","title":"libX11: Fix of 6 CVEs","description":"- CVE-2018-14599: fix off-by-one writes in XListExtensions, XGetFontPath and XListFonts\n- CVE-2018-14600: fix out-of-bounds write in XListExtensions and XGetFontPath\n- CVE-2018-14598: fix crash on invalid reply in XListExtensions and XGetFontPath\n- CVE-2021-31535: reject strings longer than USHRT_MAX before sending them on the wire\n- CVE-2023-3138: add bounds checks for extension request, event and error codes\n- CVE-2023-43787: fix integer overflow in XCreateImage leading to heap overflow","status":"published","published":"2026-10-21T20:48:54Z","modified":"2026-10-26T09:43:44.530069186Z","updated_at":"2026-11-02T15:43:54.672859Z"},{"id":"CVE-2023-3138","description":"A vulnerability was found in libX11. The security flaw occurs because the functions in src/InitExt.c in libX11 do not check that the values provided for the Request, Event, or Error IDs are within the bounds of the arrays that those functions write to, using those IDs as array indexes. They trust that they were called with values provided by an Xserver adhering to the bounds specified in the X11 protocol, as all X servers provided by X.Org do. As the protocol only specifies a single byte for these values, an out-of-bounds value provided by a malicious server (or a malicious proxy-in-the-middle) can only overwrite other portions of the Display structure and not write outside the bounds of the Display structure itself, possibly causing the client to crash with this memory corruption.","status":"published","published":"2023-06-28T00:00:00Z","modified":"2026-10-28T10:38:48.327942655Z","cwes":["CWE-119"],"updated_at":"2026-11-02T15:44:31.790231Z"},{"id":"DLA-3472-1","title":"libx11 - security update","status":"published","published":"2023-06-26T00:00:00Z","modified":"2026-03-09T01:22:46.904448Z","updated_at":"2026-11-02T15:46:11.734021Z"},{"id":"DSA-5433-1","title":"libx11 - security update","status":"published","published":"2023-06-21T00:00:00Z","modified":"2026-03-09T02:10:02.39352Z","updated_at":"2026-11-02T15:46:17.543497Z"},{"id":"MGASA-2023-0206","title":"Updated libx11 packages fix security vulnerability","description":"Buffer overflows in InitExt.c in libX11 prior to 1.8.6. (CVE-2023-3138)\n","status":"published","published":"2023-06-28T05:21:41Z","modified":"2026-04-16T04:42:53.086451474Z","updated_at":"2026-11-02T15:49:42.263076Z"},{"id":"openSUSE-SU-2024:13008-1","title":"libX11-6-1.8.5-2.1 on GA media","description":"These are all security issues fixed in the libX11-6-1.8.5-2.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T03:09:36.892406Z","updated_at":"2026-11-02T16:58:36.025801Z"},{"id":"SUSE-SU-2023:2531-1","title":"Security update for libX11","description":"This update for libX11 fixes the following issues:\n\n- CVE-2023-3138: Fixed buffer overflows in InitExt.c (bsc#1212102).\n","status":"published","published":"2023-06-19T07:49:21Z","modified":"2026-02-04T03:20:56.430326Z","updated_at":"2026-11-02T15:53:53.019382Z"},{"id":"SUSE-SU-2023:2614-1","title":"Security update for libX11","description":"This update for libX11 fixes the following issues:\n\n- CVE-2023-3138: Fixed buffer overflows in InitExt.c (bsc#1212102).\n","status":"published","published":"2023-06-22T12:02:50Z","modified":"2026-02-04T03:47:01.604793Z","updated_at":"2026-11-02T15:53:53.019382Z"},{"id":"USN-6168-1","title":"libx11 vulnerability","description":"Gregory James Duck discovered that libx11 incorrectly handled certain\nRequest, Event, or Error IDs. If a user were tricked into connecting to a\nmalicious X Server, a remote attacker could possibly use this issue to\ncause libx11 to crash, resulting in a denial of service.\n","status":"published","published":"2023-06-15T16:51:34Z","modified":"2026-04-22T10:35:49.305506Z","updated_at":"2026-11-02T16:58:16.738762Z"},{"id":"USN-6168-2","title":"libx11 vulnerability","description":"USN-6168-1 fixed a vulnerability in libx11. This update provides\nthe corresponding update for Ubuntu 14.04 ESM, Ubuntu 16.04 ESM,\nand Ubuntu 18.04 ESM.\n\nOriginal advisory details:\n\n Gregory James Duck discovered that libx11 incorrectly handled certain\n Request, Event, or Error IDs. If a user were tricked into connecting to a\n malicious X Server, a remote attacker could possibly use this issue to\n cause libx11 to crash, resulting in a denial of service.\n","status":"published","published":"2023-06-20T10:12:13Z","modified":"2026-06-29T13:50:53.490378538Z","updated_at":"2026-11-02T16:58:16.738762Z"}]}}