CVE-2026-85880
HighExploitedPublic exploitHeap-based buffer overflow in Windows ALPC allows an authorized attacker to elevate privileges locally.
Published Sep 8, 2026 · Updated Oct 14, 2026
Key Facts
Patch immediately- CVE-2026-85880 is a high-severity vulnerability (CVSS 7.8 v3.1) affecting Windows 10 1607 (Microsoft), Windows 10 1809 (Microsoft), windows 10 21H2 (Microsoft) and 14 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Sep 8, 2026. Public exploit code is available.
- EPSS estimates a 3.6% probability of exploitation in the next 30 days.
- Fixed versions are available, including Windows 10 1607 10.0.14393.9512, Windows 10 1809 10.0.17763.9245, windows 10 21H2 10.0.19044.7725.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
7.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
EPSS (30-day exploit likelihood)
3.6%
Higher than 89.3% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2026-85880 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
Heap-based buffer overflow in Windows ALPC allows an authorized attacker to elevate privileges locally.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Sep 8, 2026 | Sep 22, 2026 | Not reported |
| Industry KEV feed | Sep 8, 2026 | Sep 22, 2026 | Not reported |
| CIRCL KEV | Sep 8, 2026 | Sep 22, 2026 | Not reported |
| ENISA EUVD | Sep 8, 2026 | n/a | Not reported |
Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Affected Products
48 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Windows 10 1607Microsoft | 10.0.14393.9512 | 10.0.14393.9512 |
| Windows 10 1809Microsoft | 10.0.17763.9245 | 10.0.17763.9245 |
| windows 10 21H2Microsoft | 10.0.19044.7725 | 10.0.19044.7725 |
| windows 10 22H2Microsoft | 10.0.19045.7725 | 10.0.19045.7725 |
| Windows Server 2012Microsoft | 6.2.9200.26349, r2, >= 6.2.9200.0 | 6.2.9200.26349 |
Patched Releases
Windows 10 1607
10.0.14393.9512
Windows 10 1809
10.0.17763.9245
windows 10 21H2
10.0.19044.7725
windows 10 22H2
10.0.19045.7725
Windows Server 2012
6.2.9200.26349
windows server 2012 R2
6.3.9600.23397, 6.3.9600.23398
Windows Server 2016
10.0.14393.9512
Windows Server 2019
10.0.17763.9245
Windows Server 2022
10.0.20348.5622
Windows 10 Version 1607
10.0.14393.9512
Windows 10 Version 1809
10.0.17763.9245
Windows 10 Version 21H2
10.0.19044.7725
Windows 10 Version 22H2
10.0.19045.7725
Windows Server 2012 (Server Core installation)
6.2.9200.26349
Windows Server 2012 R2 (Server Core installation)
6.3.9600.23397, 6.3.9600.23398
Windows Server 2016 (Server Core installation)
10.0.14393.9512
Windows Server 2019 (Server Core installation)
10.0.17763.9245
Timeline
Publicly disclosed
Sep 8, 2026
Added to CISA KEV
Sep 8, 2026
Added to Industry KEV feed
Sep 8, 2026
Added to CIRCL KEV
Sep 8, 2026
Added to ENISA EUVD
Sep 8, 2026
Last updated
Oct 14, 2026
Weakness Type
- CWE-122 Heap-based Buffer Overflow
- CWE-908 Use of Uninitialized Resource
References
- advisoryhttps://chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_01882797386.html
- advisoryhttps://chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145027.html
- advisoryhttps://chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0856730748.html
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2026-85046
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2026-85880
FAQ
Common Questions.
Heap-based buffer overflow in Windows ALPC allows an authorized attacker to elevate privileges locally.
Affected: Windows 10 1607 (Microsoft) versions 10.0.14393.9512; Windows 10 1809 (Microsoft) versions 10.0.17763.9245; windows 10 21H2 (Microsoft) versions 10.0.19044.7725, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Sep 8, 2026.
Yes. It was added on Sep 8, 2026 with a federal remediation due date of Sep 22, 2026.
Public exploit code is available.
Fixed versions are available, including Windows 10 1607 10.0.14393.9512, Windows 10 1809 10.0.17763.9245, windows 10 21H2 10.0.19044.7725.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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