How severe is CVE-2026-85880?

CVE-2026-85880 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-85880 being actively exploited?

Yes. CVE-2026-85880 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-09-08, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2026-85880?

CVE-2026-85880 primarily affects Microsoft Windows 10 1607. In total, 15 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-85880?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

When was CVE-2026-85880 published?

CVE-2026-85880 was published on 2026-09-08 and last updated on 2026-09-09.

CVE-2026-85880

CVE-2026-85880 is a high-severity vulnerability in Microsoft Windows 10 1607 with a CVSS 3.x base score of 7.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2026-09-08). The underlying weakness is classified as CWE-122.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2026-09-08)
Weakness: CWE-122
Affected product: Microsoft Windows 10 1607
Published: 2026-09-08
Last modified: 2026-09-09

Description

Heap-based buffer overflow in Windows ALPC allows an authorized attacker to elevate privileges locally.

Frequently asked questions

What is CVE-2026-85880?: Heap-based buffer overflow in Windows ALPC allows an authorized attacker to elevate privileges locally.
How severe is CVE-2026-85880?: CVE-2026-85880 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-85880 being actively exploited?: Yes. CVE-2026-85880 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-09-08, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2026-85880?: CVE-2026-85880 primarily affects Microsoft Windows 10 1607. In total, 15 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-85880?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
When was CVE-2026-85880 published?: CVE-2026-85880 was published on 2026-09-08 and last updated on 2026-09-09.

References

Affected products (15)

cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*

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Other CWE-122 (Heap-based Buffer Overflow) vulnerabilities

CVE-2026-10747 — Critical (CVSS 10.0): IBM MQ Appliance could allow a remote attacker to cause a denial of service or potentially execute arbitrary code due…
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CVE-2026-24822 — Critical (CVSS 10.0): Out-of-bounds Write, Heap-based Buffer Overflow vulnerability in ttttupup wxhelper (src modules). This vulnerability is…
CVE-2025-23123 — Critical (CVSS 10.0): A malicious actor with access to the management network could execute a remote code execution (RCE) by exploiting a…
CVE-2022-34819 — Critical (CVSS 10.0): A vulnerability has been identified in SIMATIC CP 1242-7 V2 (All versions < V3.3.46), SIMATIC CP 1243-1 (All versions <…
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Browse all CWE-122 (Heap-based Buffer Overflow) vulnerabilities →