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CVE-2026-67298 is a heap buffer overflow in FreeRDP versions 3.28.0 and earlier, affecting the server-side RAIL channel handler. In rail_server_handle_messages(), a peer-controlled RAIL PDU orderLength field is reduced by RAIL_PDU_HEADER_LENGTH without first validating that the supplied length is at least the header size. Values from 0 through 3 cause unsigned integer underflow, producing a very large length. Pointer arithmetic wraparound allows this value to bypass the Stream_EnsureRemainingCapacity() check before it is supplied to WTSVirtualChannelRead(), resulting in an out-of-bounds heap write.
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No public exploit code observed for this vulnerability.
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10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability addressed by the Alma Linux ALSA-2026:61378 security update affecting FreeRDP/WinPR packages; no vulnerability-specific technical details are provided.
A vulnerability addressed by the referenced Oracle Linux FreeRDP update; no technical flaw details are provided.
An unsigned-underflow condition in a peer-controlled RAIL PDU length can lead to an out-of-bounds heap write and crash a FreeRDP server.
A FreeRDP denial-of-service vulnerability caused by an integer underflow in RAIL channel handling.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.