{"id":"CVE-2026-55639","aliases":["DEBIAN-CVE-2026-55639","EUVD-2026-46042","GHSA-6g36-mxcf-r3gc","MGASA-2026-0566","UBUNTU-CVE-2026-55639","openSUSE-SU-2026:11543-1"],"status":"published","title":"xrdp: Out-of-bounds read in GCC Conference Create Request CS_SECURITY processing (xrdp_sec_process_mcs_data_CS_SECURITY)","description":"xrdp is an open source RDP server. Versions 0.10.6 and prior contain a vulnerability concerning the parsing of Client Security Data within the Client MCS Connect Initial PDU with GCC Conference Create Request during the connection sequence. During the initial capability and security negotiation phase, the parser fails to perform sufficient length validation for the incoming data block. A remote, unauthenticated attacker could potentially exploit this flaw by sending a specially crafted RDP packet containing malformed data. Due to missing bounds checks, the xrdp process may read a small number of bytes beyond the declared data block boundary, potentially disclosing process memory contents that could be combined with other vulnerabilities. This issue has been fixed in version 0.10.6.1.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00424,"percentile":0.3711,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-125"],"published":"2026-07-20T17:14:50Z","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-6g36-mxcf-r3gc","tags":["x_refsource_CONFIRM","Vendor Advisory","advisory","report"]},{"url":"https://github.com/neutrinolabs/xrdp/releases/tag/v0.10.6.1","tags":["x_refsource_MISC","Product","Release Notes","web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55639.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55639","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-55639","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-2026-55639","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-55639","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-2026-55639","title":"xrdp: Out-of-bounds read in GCC Conference Create Request CS_SECURITY processing (xrdp_sec_process_mcs_data_CS_SECURITY)","description":"xrdp is an open source RDP server. Versions 0.10.6 and prior contain a vulnerability concerning the parsing of Client Security Data within the Client MCS Connect Initial PDU with GCC Conference Create Request during the connection sequence. During the initial capability and security negotiation phase, the parser fails to perform sufficient length validation for the incoming data block. A remote, unauthenticated attacker could potentially exploit this flaw by sending a specially crafted RDP packet containing malformed data. Due to missing bounds checks, the xrdp process may read a small number of bytes beyond the declared data block boundary, potentially disclosing process memory contents that could be combined with other vulnerabilities. This issue has been fixed in version 0.10.6.1.","status":"published","published":"2026-07-20T17:14:50.233Z","modified":"2026-07-20T19:06:59.25Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-125"],"updated_at":"2026-11-02T14:20:11.925815Z"}],"euvd":[{"id":"EUVD-2026-46042","description":"xrdp is an open source RDP server. Versions 0.10.6 and prior contain a vulnerability concerning the parsing of Client Security Data within the Client MCS Connect Initial PDU with GCC Conference Create Request during the connection sequence. During the initial capability and security negotiation phase, the parser fails to perform sufficient length validation for the incoming data block. A remote, unauthenticated attacker could potentially exploit this flaw by sending a specially crafted RDP packet containing malformed data. Due to missing bounds checks, the xrdp process may read a small number of bytes beyond the declared data block boundary, potentially disclosing process memory contents that could be combined with other vulnerabilities. This issue has been fixed in version 0.10.6.1.","status":"published","published":"2026-07-20T17:14:50Z","modified":"2026-07-20T19:06:59Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T18:19:48.530346Z"}],"nvd":[{"id":"CVE-2026-55639","description":"xrdp is an open source RDP server. Versions 0.10.6 and prior contain a vulnerability concerning the parsing of Client Security Data within the Client MCS Connect Initial PDU with GCC Conference Create Request during the connection sequence. During the initial capability and security negotiation phase, the parser fails to perform sufficient length validation for the incoming data block. A remote, unauthenticated attacker could potentially exploit this flaw by sending a specially crafted RDP packet containing malformed data. Due to missing bounds checks, the xrdp process may read a small number of bytes beyond the declared data block boundary, potentially disclosing process memory contents that could be combined with other vulnerabilities. This issue has been fixed in version 0.10.6.1.","status":"published","published":"2026-07-20T18:16:54.287Z","modified":"2026-10-24T20:10:00.137Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-125"],"updated_at":"2026-11-02T14:12:31.024898Z"}],"osv":[{"id":"CVE-2026-55639","title":"xrdp: Out-of-bounds read in GCC Conference Create Request CS_SECURITY processing (xrdp_sec_process_mcs_data_CS_SECURITY)","description":"xrdp is an open source RDP server. Versions 0.10.6 and prior contain a vulnerability concerning the parsing of Client Security Data within the Client MCS Connect Initial PDU with GCC Conference Create Request during the connection sequence. During the initial capability and security negotiation phase, the parser fails to perform sufficient length validation for the incoming data block. A remote, unauthenticated attacker could potentially exploit this flaw by sending a specially crafted RDP packet containing malformed data. Due to missing bounds checks, the xrdp process may read a small number of bytes beyond the declared data block boundary, potentially disclosing process memory contents that could be combined with other vulnerabilities. This issue has been fixed in version 0.10.6.1.","status":"published","published":"2026-07-20T17:14:50.233Z","modified":"2026-10-28T02:31:00.542604557Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"cwes":["CWE-125"],"updated_at":"2026-11-02T15:45:11.22012Z"},{"id":"DEBIAN-CVE-2026-55639","description":"xrdp is an open source RDP server. Versions 0.10.6 and prior contain a vulnerability concerning the parsing of Client Security Data within the Client MCS Connect Initial PDU with GCC Conference Create Request during the connection sequence. During the initial capability and security negotiation phase, the parser fails to perform sufficient length validation for the incoming data block. A remote, unauthenticated attacker could potentially exploit this flaw by sending a specially crafted RDP packet containing malformed data. Due to missing bounds checks, the xrdp process may read a small number of bytes beyond the declared data block boundary, potentially disclosing process memory contents that could be combined with other vulnerabilities. This issue has been fixed in version 0.10.6.1.","status":"published","published":"2026-07-20T18:16:54.287Z","modified":"2026-10-25T09:47:40.623652191Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:57.590991Z"},{"id":"UBUNTU-CVE-2026-55639","description":"xrdp is an open source RDP server. Versions 0.10.6 and prior contain a vulnerability concerning the parsing of Client Security Data within the Client MCS Connect Initial PDU with GCC Conference Create Request during the connection sequence. During the initial capability and security negotiation phase, the parser fails to perform sufficient length validation for the incoming data block. A remote, unauthenticated attacker could potentially exploit this flaw by sending a specially crafted RDP packet containing malformed data. Due to missing bounds checks, the xrdp process may read a small number of bytes beyond the declared data block boundary, potentially disclosing process memory contents that could be combined with other vulnerabilities. This issue has been fixed in version 0.10.6.1.","status":"published","published":"2026-07-20T18:16:00Z","modified":"2026-10-17T12:59:08.491566615Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","level":"medium"}],"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"}]}}