Description
FreeRDP versions 3.28.0 and earlier contain a heap buffer overflow in the server-side RAIL channel handler (rail_server_handle_messages() in channels/rail/server/rail_main.c). When processing a RAIL PDU header, the code subtracts RAIL_PDU_HEADER_LENGTH from the peer-controlled orderLength field without first verifying orderLength is at least the header length. For orderLength values 0..3 this causes an unsigned integer underflow to a very large size, which bypasses the Stream_EnsureRemainingCapacity() capacity check (due to pointer arithmetic wraparound) and is then passed to WTSVirtualChannelRead(), resulting in an out-of-bounds heap write. A malicious or compromised RDP client can exploit this to corrupt the heap and crash the server. Fixed in FreeRDP 3.29.0.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| FreeRDP | FreeRDP | < 3.29.0 | 3.29.0 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | freerdp3 | 3.29.0+dfsg-1 | — |
| Debian 13 | freerdp3 | No fix yet | — |
| Debian 12 | freerdp2 | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | freerdp3 | 3.30.0+dfsg-0ubuntu0.26.04.1 | — |
| Ubuntu 24.04 LTS | freerdp3 | 3.30.0+dfsg-0ubuntu0.24.04.1 | — |
| Ubuntu 22.04 LTS | freerdp2 | No fix yet | — |
| Ubuntu 18.04 LTS | freerdp | No fix yet | — |
| Ubuntu 16.04 LTS | freerdp | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | freerdp2 | No fix yet | — |
| Ubuntu Pro 20.04 LTS | freerdp2 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | freerdp2 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | freerdp +5 | 2:3.10.3-12.el10_2.10 | RHSA-2026:61378 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | freerdp +5 | 2:3.10.3-3.el10_0.16 | RHSA-2026:68706 |
| RHEL 7 ELS | freerdp +4 | 2.1.1-5.el7_9.12 | RHSA-2026:68707 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | freerdp +5 | 2:3.10.3-12.el10_2.10 | ALSA-2026:61378 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | freerdp | 2:3.10.3-12.el10_2.10 | RLSA-2026:61378 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | freerdp +5 | 2:3.6.3-1.amzn2023.0.15 | ALAS2023-2026-2111 |
| Amazon Linux 2 | freerdp +4 | 2:2.11.7-1.amzn2.0.14 | ALAS2-2026-3887 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | freerdp +4 | 2.1.1-5.0.13.el7_9 | ELSA-2026-68707 |
Advisories 9
- RHSA-2026:68706 Red Hat Security Advisory: freerdp security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:61378 Red Hat Security Advisory: freerdp security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- ALSA-2026:61378 Important: freerdp security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2026:68707 Red Hat Security Advisory: freerdp security update Red Hat Security Advisories (RHSA) · Sep 30, 2026
- WID-SEC-2026-2384 FreeRDP: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 28, 2026
- ELSA-2026-68707 Important: freerdp security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Sep 28, 2026
- ALAS2-2026-3887 Important: freerdp security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Sep 9, 2026
- RLSA-2026:61378 Important: freerdp security update Rocky Linux Security Advisories · Sep 1, 2026
- ALAS2023-2026-2111 Important: freerdp security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 31, 2026
References
- GitHub Security Advisory (GHSA-qmvw-52ph-q5pv) vendor-advisory
- Patch Commit patch
- Patch Commit patch
- VulnCheck Advisory: FreeRDP 3.28.0 Heap Buffer Overflow via RAIL orderLength Underflow third-party-advisory