An update for freerdp is now available for openEuler-24.03-LTS-SP4 Security Advisory openeuler-security@openeuler.org openEuler security committee openEuler-SA-2026-4656 Final 1.0 1.0 2026-10-29 Initial 2026-10-29 2026-10-29 openEuler SA Tool V1.0 2026-10-29 freerdp security update An update for freerdp is now available for openEuler-24.03-LTS-SP4 FreeRDP is a client implementation of the Remote Desktop Protocol (RDP) that follows Microsoft's open specifications. This package provides the client applications xfreerdp. Security Fix(es): FreeRDP versions before 3.31.0 contain a heap buffer overflow vulnerability in nego_send_negotiation_request() that fails to validate the LB_LOAD_BALANCE_INFO field length before writing to a fixed 512-byte buffer. A malicious RDP server or man-in-the-middle can send a Server Redirection PDU with an oversized LB_LOAD_BALANCE_INFO value to overflow the buffer with attacker-controlled content, causing denial of service or heap corruption before authentication completes.(CVE-2026-91953) FreeRDP before 3.31.0 contains an out-of-bounds read vulnerability in the URBDRC channel's func_get_ep_desc function that indexes interface arrays by position instead of protocol field InterfaceNumber. A malicious RDP server can send a crafted SELECT_CONFIGURATION message with permuted InterfaceNumber values to read past allocated heap memory and crash the client.(CVE-2026-91956) FreeRDP is an implementation of the Remote Desktop Protocol (RDP) open sourced by the FreeRDP team. FreeRDP versions before 3.31.0 have a buffer error vulnerability. This vulnerability originates from buffer over-reading in the rts_read_result function in the RPC gateway transport parser. An attacker can trigger an out-of-bounds read by sending a specially crafted BIND_ACK PDU with truncated result entries, causing the process to terminate.(CVE-2026-91959) FreeRDP versions before 3.31.0 contain an uninitialized heap memory disclosure vulnerability in the urbdrc USB redirection channel. A malicious RDP server can induce failing USB transfers to read uninitialized heap memory from the client, defeating ASLR and enabling remote code execution when chained with memory corruption vulnerabilities.(CVE-2026-91963) FreeRDP versions before 3.31.0 contain a heap-based buffer overflow in nego_send_negotiation_request when processing Server Redirection PDU messages with attacker-controlled LoadBalanceInfo fields. A malicious RDP server can trigger the overflow by sending an arbitrary-length field that gets written to a fixed 512-byte buffer without validation, causing client crashes or potential code execution when chained with memory disclosure.(CVE-2026-91964) An update for freerdp is now available for openEuler-24.03-LTS-SP4. openEuler Security has rated this update as having a security impact of high. A Common Vunlnerability Scoring System(CVSS)base score,which gives a detailed severity rating, is available for each vulnerability from the CVElink(s) in the References section. High freerdp https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4656 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-91953 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-91956 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-91959 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-91963 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-91964 https://nvd.nist.gov/vuln/detail/CVE-2026-91953 https://nvd.nist.gov/vuln/detail/CVE-2026-91956 https://nvd.nist.gov/vuln/detail/CVE-2026-91959 https://nvd.nist.gov/vuln/detail/CVE-2026-91963 https://nvd.nist.gov/vuln/detail/CVE-2026-91964 openEuler-24.03-LTS-SP4 freerdp-2.11.8-11.oe2403sp4.aarch64.rpm freerdp-debuginfo-2.11.8-11.oe2403sp4.aarch64.rpm freerdp-debugsource-2.11.8-11.oe2403sp4.aarch64.rpm freerdp-devel-2.11.8-11.oe2403sp4.aarch64.rpm freerdp-help-2.11.8-11.oe2403sp4.aarch64.rpm libwinpr-2.11.8-11.oe2403sp4.aarch64.rpm libwinpr-devel-2.11.8-11.oe2403sp4.aarch64.rpm freerdp-2.11.8-11.oe2403sp4.src.rpm freerdp-2.11.8-11.oe2403sp4.x86_64.rpm freerdp-debuginfo-2.11.8-11.oe2403sp4.x86_64.rpm freerdp-debugsource-2.11.8-11.oe2403sp4.x86_64.rpm freerdp-devel-2.11.8-11.oe2403sp4.x86_64.rpm freerdp-help-2.11.8-11.oe2403sp4.x86_64.rpm libwinpr-2.11.8-11.oe2403sp4.x86_64.rpm libwinpr-devel-2.11.8-11.oe2403sp4.x86_64.rpm FreeRDP versions before 3.31.0 contain a heap buffer overflow vulnerability in nego_send_negotiation_request() that fails to validate the LB_LOAD_BALANCE_INFO field length before writing to a fixed 512-byte buffer. A malicious RDP server or man-in-the-middle can send a Server Redirection PDU with an oversized LB_LOAD_BALANCE_INFO value to overflow the buffer with attacker-controlled content, causing denial of service or heap corruption before authentication completes. 2026-10-29 CVE-2026-91953 openEuler-24.03-LTS-SP4 High 7.1 AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X freerdp security update 2026-10-29 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4656 FreeRDP before 3.31.0 contains an out-of-bounds read vulnerability in the URBDRC channel's func_get_ep_desc function that indexes interface arrays by position instead of protocol field InterfaceNumber. A malicious RDP server can send a crafted SELECT_CONFIGURATION message with permuted InterfaceNumber values to read past allocated heap memory and crash the client. 2026-10-29 CVE-2026-91956 openEuler-24.03-LTS-SP4 High 7.1 AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X freerdp security update 2026-10-29 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4656 FreeRDP is an implementation of the Remote Desktop Protocol (RDP) open sourced by the FreeRDP team. FreeRDP versions before 3.31.0 have a buffer error vulnerability. This vulnerability originates from buffer over-reading in the rts_read_result function in the RPC gateway transport parser. An attacker can trigger an out-of-bounds read by sending a specially crafted BIND_ACK PDU with truncated result entries, causing the process to terminate. 2026-10-29 CVE-2026-91959 openEuler-24.03-LTS-SP4 High 7.1 AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X freerdp security update 2026-10-29 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4656 FreeRDP versions before 3.31.0 contain an uninitialized heap memory disclosure vulnerability in the urbdrc USB redirection channel. A malicious RDP server can induce failing USB transfers to read uninitialized heap memory from the client, defeating ASLR and enabling remote code execution when chained with memory corruption vulnerabilities. 2026-10-29 CVE-2026-91963 openEuler-24.03-LTS-SP4 Medium 6.5 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N freerdp security update 2026-10-29 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4656 FreeRDP versions before 3.31.0 contain a heap-based buffer overflow in nego_send_negotiation_request when processing Server Redirection PDU messages with attacker-controlled LoadBalanceInfo fields. A malicious RDP server can trigger the overflow by sending an arbitrary-length field that gets written to a fixed 512-byte buffer without validation, causing client crashes or potential code execution when chained with memory disclosure. 2026-10-29 CVE-2026-91964 openEuler-24.03-LTS-SP4 High 8.7 AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X freerdp security update 2026-10-29 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4656