CVE-2026-26178
Local privilege escalation in Windows WARP due to integer truncation
Is CVE-2026-26178 being exploited?
Not confirmed. CVE-2026-26178 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 0.42% probability of exploitation in the next 30 days.
How severe is CVE-2026-26178?
CVE-2026-26178 is rated High with a CVSS score of 8.8. 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-2026-26178?
Yes. A fix has been recorded for CVE-2026-26178. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-26178 affect?
CVE-2026-26178 affects Windows OS components (WARP), Windows 10/11 clients, Windows Server. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-26178?
Apply updates when released; enforce least privilege; monitor WARP activity
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Local privilege escalation allowing SYSTEM access via WARP truncation on Windows
Patch when possible
- affected>= 10.0.14393.0 and < 10.0.14393.9060
- affected>= 10.0.17763.0 and < 10.0.17763.8644
- affected>= 10.0.19044.0 and < 10.0.19044.7184
- affected>= 10.0.19045.0 and < 10.0.19045.7184
- affected>= 10.0.22631.0 and < 10.0.22631.6936
- affected>= 10.0.22631.0 and < 10.0.22631.6936
- affected>= 10.0.26100.0 and < 10.0.26100.8246
- affected>= 10.0.26200.0 and < 10.0.26200.8246
- affected>= 10.0.14393.0 and < 10.0.14393.9060
- affected>= 10.0.14393.0 and < 10.0.14393.9060
- affected>= 10.0.17763.0 and < 10.0.17763.8644
- affected>= 10.0.17763.0 and < 10.0.17763.8644
- affected>= 10.0.20348.0 and < 10.0.20348.5020
- affected>= 10.0.25398.0 and < 10.0.25398.2274
- affected>= 10.0.26100.0 and < 10.0.26100.32690
- affected>= 10.0.26100.0 and < 10.0.26100.32690
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.