CVE-2026-57156
FreeRDP 32-bit integer overflow -> heap overflow; potential RCE (pre-3.28.0).
Is CVE-2026-57156 being exploited?
Not confirmed. CVE-2026-57156 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 0.70% probability of exploitation in the next 30 days.
How severe is CVE-2026-57156?
CVE-2026-57156 is rated High with a CVSS score of 8.6. 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-2026-57156?
Yes. A fix has been recorded for CVE-2026-57156. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-57156 affect?
CVE-2026-57156 affects FreeRDP 32-bit clients < 3.28.0, libfreerdp-based applications, RDP clients using libfreerdp on Linux/Unix. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-57156?
Upgrade to FreeRDP 3.28.0+; block/untrust unknown RDP peers and restrict RDP access.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote heap buffer overflow via a malicious RDP peer on 32-bit FreeRDP clients, enabling potential remote code execution or crash.
Immediate action required
- affected< 3.28.0
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.