{"id":"CVE-2026-54538","aliases":["DEBIAN-CVE-2026-54538","EUVD-2026-46032","GHSA-9j3q-9mvw-qv7j","MGASA-2026-0566","UBUNTU-CVE-2026-54538","openSUSE-SU-2026:11543-1"],"status":"published","title":"xrdp: Pre-auth infinite loop via totalLength=0 in TS_SHARECONTROLHEADER","description":"xrdp is an open source RDP server. In versions 0.10.6 and prior, a n issue was discovered where the software fails to properly validate the totalLength field within the RDP protocol control header during packet reception. An unauthenticated remote attacker can exploit this vulnerability by sending a specially crafted packet that forces the xrdp process or thread into an infinite, CPU-bound loop. Because the internal pointer fails to advance and the deadlock prevention mechanism is bypassed for specific protocol data unit types, the process consumes excessive CPU resources indefinitely. This can render the xrdp service unavailable and potentially lead to system-wide resource exhaustion if multiple malicious connections are established. This issue has been fixed in version 0.10.6.1.","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":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00672,"percentile":0.52342,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-835"],"published":"2026-07-20T16:57:32Z","modified":"2026-10-30T01:28:13Z","fixes":[{"ecosystem":"Debian:12","package":"xrdp","fixed_in":["0.9.21.1-1+deb12u3"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"xrdp","fixed_in":["0.10.1-3.1+deb13u2"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"xrdp","fixed_in":["0.10.6.1-2"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"xrdp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.21.1-1+deb12u3"}]}],"versions":["0.9.21.1-1","0.9.21.1-1+deb12u1","0.9.21.1-1+deb12u2"]},{"source":"osv","ecosystem":"Debian:13","package":"xrdp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.10.1-3.1+deb13u2"}]}],"versions":["0.10.1-3.1","0.10.1-3.1+deb13u1"]},{"source":"osv","ecosystem":"Debian:14","package":"xrdp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.10.6.1-2"}]}],"versions":["0.10.1-3.1","0.10.1-4","0.10.1-4.1","0.10.2-1","0.10.2-2","0.10.4.1-1","0.10.4.1-2","0.10.5-1","0.10.5-2","0.10.5-3","0.10.5-4","0.10.5-5","0.10.6-1","0.10.6-2","0.10.6-3","0.10.6-4","0.10.6-5","0.10.6.1-1","0.10.6.1-2~bpo13+1"]},{"source":"osv","ecosystem":"Mageia:10","package":"xrdp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.10.6.1-2.mga10"}]}],"bundled":10},{"source":"osv","ecosystem":"Ubuntu:Pro:14.04:LTS","package":"xrdp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.6.0-1","0.6.0-1ubuntu0.1","0.6.0-1ubuntu0.1+esm1","0.6.0-1ubuntu0.1+esm2","0.6.0-1ubuntu0.1+esm3"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"xrdp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.6.1-2","0.6.1-2ubuntu0.1","0.6.1-2ubuntu0.3","0.6.1-2ubuntu0.3+esm1","0.6.1-2ubuntu0.3+esm2","0.6.1-2ubuntu0.3+esm3"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"xrdp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.1-9","0.9.4-1","0.9.4-2","0.9.4-3","0.9.4-4","0.9.4-5","0.9.5-1","0.9.5-1build1","0.9.5-2","0.9.5-2ubuntu0.1~esm1","0.9.5-2ubuntu0.1~esm2","0.9.5-2ubuntu0.1~esm3"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"xrdp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.9-1","0.9.12-1","0.9.12-1ubuntu0.1","0.9.12-1ubuntu0.1+esm1","0.9.12-1ubuntu0.1+esm2"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"xrdp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.15-1ubuntu1","0.9.17-1","0.9.17-2","0.9.17-2ubuntu1","0.9.17-2ubuntu2","0.9.17-2ubuntu2+esm1","0.9.17-2ubuntu3","0.9.17-2ubuntu3+esm1","0.9.17-2ubuntu3+esm2","0.9.17-2ubuntu3.1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"xrdp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.21.1-1","0.9.24-2","0.9.24-3","0.9.24-3build1","0.9.24-3build2","0.9.24-4","0.9.24-4ubuntu0.1~esm1","0.9.24-4ubuntu0.1"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"xrdp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.10.1-3","0.10.1-3.1","0.10.1-3.1+deb13u1build0.25.10.1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"xrdp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.10.1-4.1","0.10.6.1-2ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"xrdp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.10.1-3.1","0.10.1-4","0.10.1-4.1","0.10.1-4.1ubuntu0.1"]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"xrdp","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.10.6.1-1.1"}]}],"bundled":10}],"products":[{"vendor":"neutrinolabs","product":"xrdp"}],"references":[{"url":"https://github.com/neutrinolabs/xrdp/security/advisories/GHSA-9j3q-9mvw-qv7j","tags":["x_refsource_CONFIRM","Vendor Advisory","advisory","report"]},{"url":"https://github.com/neutrinolabs/xrdp/releases/tag/v0.10.6.1","tags":["x_refsource_MISC","Release Notes","web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54538.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54538","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-54538","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2026-0566.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=35945","tags":["report"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5ZQ6QE47Z3SMILAAOHQ2RKDQFJOK2M4X/","tags":["web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JWYOEVBA3574FXNPXKDS3FPNCQ3SDAOM/","tags":["web"]},{"url":"https://lists.debian.org/debian-security-announce/2026/msg00380.html","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2026-54538","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-54538","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-41252","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-41521","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-42218","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-44178","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-44978","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-54538","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-55238","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-55626","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-55639","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-55645","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-54538","title":"xrdp: Pre-auth infinite loop via totalLength=0 in TS_SHARECONTROLHEADER","description":"xrdp is an open source RDP server. In versions 0.10.6 and prior, a n issue was discovered where the software fails to properly validate the totalLength field within the RDP protocol control header during packet reception. An unauthenticated remote attacker can exploit this vulnerability by sending a specially crafted packet that forces the xrdp process or thread into an infinite, CPU-bound loop. Because the internal pointer fails to advance and the deadlock prevention mechanism is bypassed for specific protocol data unit types, the process consumes excessive CPU resources indefinitely. This can render the xrdp service unavailable and potentially lead to system-wide resource exhaustion if multiple malicious connections are established. This issue has been fixed in version 0.10.6.1.","status":"published","published":"2026-07-20T16:57:32.738Z","modified":"2026-07-20T18:48:02.307Z","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":"cna"}],"cwes":["CWE-835"],"updated_at":"2026-11-02T13:38:09.774038Z"}],"euvd":[{"id":"EUVD-2026-46032","description":"xrdp is an open source RDP server. In versions 0.10.6 and prior, a n issue was discovered where the software fails to properly validate the totalLength field within the RDP protocol control header during packet reception. An unauthenticated remote attacker can exploit this vulnerability by sending a specially crafted packet that forces the xrdp process or thread into an infinite, CPU-bound loop. Because the internal pointer fails to advance and the deadlock prevention mechanism is bypassed for specific protocol data unit types, the process consumes excessive CPU resources indefinitely. This can render the xrdp service unavailable and potentially lead to system-wide resource exhaustion if multiple malicious connections are established. This issue has been fixed in version 0.10.6.1.","status":"published","published":"2026-07-20T16:57:32Z","modified":"2026-07-20T18:48:02Z","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":"2026-11-02T18:19:48.530346Z"}],"nvd":[{"id":"CVE-2026-54538","description":"xrdp is an open source RDP server. In versions 0.10.6 and prior, a n issue was discovered where the software fails to properly validate the totalLength field within the RDP protocol control header during packet reception. An unauthenticated remote attacker can exploit this vulnerability by sending a specially crafted packet that forces the xrdp process or thread into an infinite, CPU-bound loop. Because the internal pointer fails to advance and the deadlock prevention mechanism is bypassed for specific protocol data unit types, the process consumes excessive CPU resources indefinitely. This can render the xrdp service unavailable and potentially lead to system-wide resource exhaustion if multiple malicious connections are established. This issue has been fixed in version 0.10.6.1.","status":"published","published":"2026-07-20T17:17:59.723Z","modified":"2026-10-24T20:10:00.137Z","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":"secondary"}],"cwes":["CWE-835"],"updated_at":"2026-11-02T14:12:31.024898Z"}],"osv":[{"id":"CVE-2026-54538","title":"xrdp: Pre-auth infinite loop via totalLength=0 in TS_SHARECONTROLHEADER","description":"xrdp is an open source RDP server. In versions 0.10.6 and prior, a n issue was discovered where the software fails to properly validate the totalLength field within the RDP protocol control header during packet reception. An unauthenticated remote attacker can exploit this vulnerability by sending a specially crafted packet that forces the xrdp process or thread into an infinite, CPU-bound loop. Because the internal pointer fails to advance and the deadlock prevention mechanism is bypassed for specific protocol data unit types, the process consumes excessive CPU resources indefinitely. This can render the xrdp service unavailable and potentially lead to system-wide resource exhaustion if multiple malicious connections are established. This issue has been fixed in version 0.10.6.1.","status":"published","published":"2026-07-20T16:57:32.738Z","modified":"2026-10-28T02:30:23.368658704Z","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-835"],"updated_at":"2026-11-02T15:45:10.818486Z"},{"id":"DEBIAN-CVE-2026-54538","description":"xrdp is an open source RDP server. In versions 0.10.6 and prior, a n issue was discovered where the software fails to properly validate the totalLength field within the RDP protocol control header during packet reception. An unauthenticated remote attacker can exploit this vulnerability by sending a specially crafted packet that forces the xrdp process or thread into an infinite, CPU-bound loop. Because the internal pointer fails to advance and the deadlock prevention mechanism is bypassed for specific protocol data unit types, the process consumes excessive CPU resources indefinitely. This can render the xrdp service unavailable and potentially lead to system-wide resource exhaustion if multiple malicious connections are established. This issue has been fixed in version 0.10.6.1.","status":"published","published":"2026-07-20T17:17:59.723Z","modified":"2026-10-25T09:47:35.052837091Z","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":"2026-11-02T15:45:57.236551Z"},{"id":"UBUNTU-CVE-2026-54538","description":"xrdp is an open source RDP server. In versions 0.10.6 and prior, a n issue was discovered where the software fails to properly validate the totalLength field within the RDP protocol control header during packet reception. An unauthenticated remote attacker can exploit this vulnerability by sending a specially crafted packet that forces the xrdp process or thread into an infinite, CPU-bound loop. Because the internal pointer fails to advance and the deadlock prevention mechanism is bypassed for specific protocol data unit types, the process consumes excessive CPU resources indefinitely. This can render the xrdp service unavailable and potentially lead to system-wide resource exhaustion if multiple malicious connections are established. This issue has been fixed in version 0.10.6.1.","status":"published","published":"2026-07-20T17:17:00Z","modified":"2026-10-17T12:59:06.978959114Z","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":"2026-11-02T16:56:41.382716Z"},{"id":"MGASA-2026-0566","title":"Updated xrdp package fixes security vulnerabilities","description":"lib_palette_update Heap Buffer Overflow \u0026 RCE. (CVE-2026-41252)\nlib_framebuffer_update Has Integer Overflow Heap Info Leak \u0026 ASLR\nBypass. (CVE-2026-41521)\nChannel Data Forwarding Fixed-Size Buffer Overflow. (CVE-2026-44178)\nXRDP is vulnerable to a server timing attack, leading to user\nenumeration. (CVE-2026-42218)\nUnchecked FIPS padding length in standard RDP Security causes heap\nout-of-bounds read in HMAC verification. (CVE-2026-44978)\nPre-auth infinite loop via totalLength=0 in TS_SHARECONTROLHEADER.\n(CVE-2026-54538)\nMalformed Confirm Active capability sets cause out-of-bounds reads.\n(CVE-2026-55238)\nNo authentication required with Xvnc backend. (CVE-2026-55626)\nOut-of-bounds read in GCC Conference Create Request CS_SECURITY\nprocessing (xrdp_sec_process_mcs_data_CS_SECURITY). (CVE-2026-55639)\nOut-of-bounds read in Client Control PDU processing\n(xrdp_rdp_process_data_control). (CVE-2026-55645)\n","status":"published","published":"2026-10-30T01:10:00Z","modified":"2026-10-30T01:28:13.647254405Z","updated_at":"2026-11-02T15:49:43.795591Z"},{"id":"openSUSE-SU-2026:11543-1","title":"xrdp-0.10.6.1-1.1 on GA media","description":"These are all security issues fixed in the xrdp-0.10.6.1-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-08-18T00:00:00Z","modified":"2026-08-19T18:23:34.611687905Z","updated_at":"2026-11-02T16:58:39.516824Z"}]}}