CVE-2026-31806
Heap overflow in FreeRDP gdi_surface_bits NSCodec (pre-3.24.0)
Is CVE-2026-31806 being exploited?
Not confirmed. CVE-2026-31806 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.66% probability of exploitation in the next 30 days.
How severe is CVE-2026-31806?
CVE-2026-31806 is rated Critical with a CVSS score of 9.3. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-31806?
Yes. A fix has been recorded for CVE-2026-31806. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-31806 affect?
CVE-2026-31806 affects FreeRDP pre-3.24.0, RDP clients/servers using FreeRDP. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-31806?
Upgrade to FreeRDP 3.24.0+
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
RDP bitmap data can overflow heap memory via server-controlled bmp.width/height, risking remote code execution.
Patch when possible
- affected< 3.24.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.