CVE-2026-67306: FreeRDP vulnerability
CVE-2026-67306 affects FreeRDP. The flaw is described as a out-of-bounds read vulnerability.
What happened
CVE-2026-67306: FreeRDP versions 3 28 0 and earlier contain an out-of-bounds read vulnerability in the RDP6 planar RLE bitmap decoder functions planar_decompress_plan. 0 and earlier contain an out-of-bounds read vulnerability in the RDP6 planar RLE bitmap decoder functions planar_decompress_plane_rle and planar_decompress_plane_rle_only in libfreerdp/codec/planar. A security weakness in FreeRDP is being tracked as CVE-2026-67306.
CVE-2026-67306 affects FreeRDP. Only the 1-byte control byte is bounds-checked; the subsequent 0–15 attacker-declared raw bytes are read without validating that the source buffer contains them. A malicious or compromised RDP serv.
The flaw is described as a out-of-bounds read vulnerability. An out-of-bounds read lets software read memory outside the intended boundary.
Editorial note: this News Brief follows the available evidence and adds length only when additional facts or useful context are available. Where public reporting does not establish a specific victim sequence, CyberDeltaForce does not present one as fact.
What the reporting and advisory establish
0 and earlier contain an out-of-bounds read vulnerability in the RDP6 planar RLE bitmap decoder functions planar_decompress_plane_rle and planar_decompress_plane_rle_only in libfreerdp/codec/planar.
Only the 1-byte control byte is bounds-checked; the subsequent 0–15 attacker-declared raw bytes are read without validating that the source buffer contains them.
A malicious or compromised RDP serv
A security weakness in FreeRDP is being tracked as CVE-2026-67306. The flaw is described as a out-of-bounds read vulnerability. An out-of-bounds read lets software read memory outside the intended boundary. The practical consequence can include unintended data exposure or application instability, depending on what sits next to the affected memory region. Only the 1-byte control byte is bounds-checked; the subsequent 0–15 attacker-declared raw bytes are read without validating that the source buffer contains them. A malicious or compromised RDP serv.
What this means for your environment
Move from the published facts to the technical path, exposure conditions and defensive decisions that matter in a real environment.
Attack & Exploitation Path
The sequence below shows how the vulnerability can be reached and what successful exploitation can produce. Each stage is labeled by evidence status.
Required condition: FreeRDP is present and the vulnerable function is reachable in the way the software is normally used.
Required condition: attacker-controlled input or the relevant workflow reaches the affected code path.
the reported out-of-bounds read is triggered inside FreeRDP, crossing the security boundary described by the advisory or vulnerability record.
Not publicly disclosed in enough detail to state a specific post-exploitation result without inference.
Map FreeRDP to real assets, verify the vendor fix or mitigation, confirm the vulnerable path is no longer reachable, and review relevant telemetry for behavior consistent with exploitation.
Why this matters to you
CVE-2026-67306 matters because the practical risk is not the score alone — it is whether FreeRDP exists in your environment and whether the reported trigger or exposure path can reach it. The current severity is MEDIUM 5.4. No exploitation flag is currently present in the CDF data, but that does not remove the need to validate affected systems.
Does this deserve attention in my environment?
Check the conditions below against your use of FreeRDP.
Select the conditions that are true in your environment. Leaving a condition unselected does not mean you are safe — it only means you have not marked it as applicable.
- Search endpoint, software and asset inventory for FreeRDP.
- Confirm the vendor-recommended fixed version or mitigation and verify deployment, not just assignment, across affected assets.
- Review relevant endpoint, application, network or identity telemetry for activity associated with exploitation of the affected component.
- Track vendor and government guidance for any change in exploitation status while remediation is underway.
What remains unconfirmed
- Available reporting does not currently indicate exploitation, but that can change as vendor, government or threat-intelligence reporting develops.
Sources & References
Original reporting and technical references are kept here for readers who want to verify the facts. Publisher names stay out of the reading flow above.