Double Free in Microsoft Windows_10_1607
CVE-2026-21530
Double free in Windows Rich Text Edit allows an authorized attacker to elevate privileges locally.
Vulnerability class: Double Free
EPSS: 0.001 (17.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Microsoft Windows_10_1607
- Microsoft Windows_10_1809
- Microsoft Windows_10_21h2
- Microsoft Windows_10_22h2
- Microsoft Windows 10 Version 1607 — versions 10.0.14393.0
- Microsoft Windows 10 Version 1809 — versions 10.0.17763.0
- Microsoft Windows 10 Version 21h2 — versions 10.0.19044.0
- Microsoft Windows 10 Version 22h2 — versions 10.0.19045.0
- Microsoft Windows_11_23h2
- Microsoft Windows_11_24h2
Weakness classification (CWE)
References
- Windows Rich Text Edit Elevation of Privilege Vulnerability (vendor-advisory, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-21530?
- CVE-2026-21530 is a medium-severity vulnerability in Microsoft Windows_10_1607, classified under Double Free. CVSS score: 6.7/10. Published 2026-05-12.
- How severe is CVE-2026-21530?
- Medium severity. CVSS v3 base score is 6.7 out of 10.