RDP client remote code execution affects widely deployed endpoint software and can lead to mass compromise of corporate endpoints and remote access, requiring broad IT action.
CVE-2026-54990
Heap buffer overflow in Remote Desktop Client allows remote code execution over the network.
Is CVE-2026-54990 being exploited?
Not confirmed. CVE-2026-54990 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 0.82% probability of exploitation in the next 30 days.
How severe is CVE-2026-54990?
CVE-2026-54990 is rated Critical. 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-2026-54990?
Yes. A fix has been recorded for CVE-2026-54990. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-54990 affect?
CVE-2026-54990 affects Remote Desktop Client software, Endpoints running RDP clients (Windows/macOS/Linux), Enterprise remote-access clients. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-54990?
Apply vendor patch when released; until then block/limit RDP client network access and enforce network-level controls.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution via network against Remote Desktop Client; attacker can run arbitrary code as client user and potentially fully compromise endpoints.
Immediate action required
- affected>= 10.0.26100.0 and < 10.0.26100.8875
- affected>= 10.0.26200.0 and < 10.0.26200.8875
- affected>= 10.0.28000.0 and < 10.0.28000.2525
- affected>= 10.0.26100.0 and < 10.0.26100.33158
- affected>= 10.0.26100.0 and < 10.0.26100.33158
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.