RHSA-2026:93559HighCVSS 8.8

Red Hat Security Advisory: freerdp security update

Published
November 2, 2026
Last Modified
November 6, 2026

🔗 CVE IDs covered (8)

CVE-2026-91947 →CVE-2026-91953 →CVE-2026-91954 →CVE-2026-91956 →CVE-2026-91959 →CVE-2026-91963 →CVE-2026-91964 →CVE-2026-91946 →

📋 Description

CVE-2026-91946 — FreeRDP: FreeRDP: Information Disclosure via RDPGFX ResetGraphics PDU CVE-2026-91947 — FreeRDP: FreeRDP: Use-after-free vulnerability in DRDYNVC parser leads to memory corruption CVE-2026-91953 — FreeRDP: FreeRDP: Heap buffer overflow via oversized LB_LOAD_BALANCE_INFO routing token can lead to heap corruption. CVE-2026-91954 — FreeRDP: FreeRDP: Denial of Service via crafted Surface Bits command CVE-2026-91956 — FreeRDP: FreeRDP: Denial of Service via out-of-bounds read in URBDRC channel CVE-2026-91959 — FreeRDP: FreeRDP: Denial of Service due to buffer over-read in RPC gateway CVE-2026-91963 — FreeRDP: FreeRDP: Remote code execution via uninitialized heap memory disclosure CVE-2026-91964 — FreeRDP: FreeRDP: Remote code execution via heap buffer overflow in Server Redirection PDU

🎯 Affected products49

  • Red Hat Enterprise Linux Server (v. 7 ELS)
  • Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • freerdp-0:2.1.1-5.el7_9.14.ppc64 as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • freerdp-0:2.1.1-5.el7_9.14.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • freerdp-0:2.1.1-5.el7_9.14.s390x as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • freerdp-0:2.1.1-5.el7_9.14.src as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • freerdp-0:2.1.1-5.el7_9.14.x86_64 as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • freerdp-debuginfo-0:2.1.1-5.el7_9.14.i686 as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • freerdp-debuginfo-0:2.1.1-5.el7_9.14.i686 as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • freerdp-debuginfo-0:2.1.1-5.el7_9.14.ppc as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • freerdp-debuginfo-0:2.1.1-5.el7_9.14.ppc as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • freerdp-debuginfo-0:2.1.1-5.el7_9.14.ppc64 as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • freerdp-debuginfo-0:2.1.1-5.el7_9.14.ppc64 as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • freerdp-debuginfo-0:2.1.1-5.el7_9.14.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • freerdp-debuginfo-0:2.1.1-5.el7_9.14.ppc64le as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • freerdp-debuginfo-0:2.1.1-5.el7_9.14.s390 as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • freerdp-debuginfo-0:2.1.1-5.el7_9.14.s390 as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • freerdp-debuginfo-0:2.1.1-5.el7_9.14.s390x as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • freerdp-debuginfo-0:2.1.1-5.el7_9.14.s390x as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • freerdp-debuginfo-0:2.1.1-5.el7_9.14.x86_64 as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • freerdp-debuginfo-0:2.1.1-5.el7_9.14.x86_64 as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • freerdp-devel-0:2.1.1-5.el7_9.14.i686 as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • freerdp-devel-0:2.1.1-5.el7_9.14.ppc as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • freerdp-devel-0:2.1.1-5.el7_9.14.ppc64 as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • freerdp-devel-0:2.1.1-5.el7_9.14.ppc64le as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • freerdp-devel-0:2.1.1-5.el7_9.14.s390 as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • freerdp-devel-0:2.1.1-5.el7_9.14.s390x as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • freerdp-devel-0:2.1.1-5.el7_9.14.x86_64 as a component of Red Hat Enterprise Linux Server Optional (v. 7 ELS)
  • freerdp-libs-0:2.1.1-5.el7_9.14.i686 as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • freerdp-libs-0:2.1.1-5.el7_9.14.ppc as a component of Red Hat Enterprise Linux Server (v. 7 ELS)
  • +19 more not shown

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Workaround: To mitigate this issue, restrict network access to FreeRDP server instances to only trusted clients and networks. Configure firewall rules to limit inbound connections to the RDP port (typically 3389) from untrusted sources. If FreeRDP server functionality is not required, consider disabling or uninstalling the FreeRDP server component. Workaround: The vulnerability requires an authenticated client to interact with the FreeRDP server. To mitigate this issue, restrict network access to the FreeRDP server to only trusted clients and networks. If the FreeRDP server functionality is not required, consider disabling or uninstalling the FreeRDP server component to eliminate the attack surface. Workaround: To prevent exploitation of this heap buffer overflow, FreeRDP clients should only be used to connect to trusted RDP servers. This operational control reduces the risk of encountering a malicious server redirection PDU. Workaround: To mitigate this issue, users should avoid connecting to untrusted or unknown RDP servers with FreeRDP clients. This vulnerability requires a FreeRDP client to connect to a malicious RDP server to be exploited. Workaround: To mitigate this issue, users should avoid connecting to untrusted or unverified RDP servers. Restricting FreeRDP client connections to known, trusted RDP servers can prevent exploitation of this vulnerability. Workaround: To mitigate this issue, restrict network access to any FreeRDP instance operating in a server or gateway role, limiting connections to trusted clients or networks. If FreeRDP is used as a client, avoid connecting to untrusted or malicious RDP servers to prevent exploitation. Workaround: To reduce exposure, avoid connecting to untrusted RDP servers or disable the FreeRDP USB redirection channel if it is not required. When using the `xfreerdp` client, ensure that USB redirection is not enabled. This can be done by omitting the `/usb` or `/usb-redir` command-line options, or by explicitly disabling the `urbdrc` channel through FreeRDP configuration if available. Disabling this feature will prevent the redirection of USB devices to the remote session. Workaround: Users of FreeRDP clients should avoid connecting to untrusted or unknown RDP servers. This operational control reduces the risk of exploitation, as a malicious server is required to trigger the heap-based buffer overflow.

🔗 References (11)