October 2026 CVE archive
Records published in NIST NVD between Oct 1 and Oct 31, 2026 (UTC). Data imported from the NVD CVE API 2.0 and the CISA KEV catalog; each record shows its own source and verification time.
Total records
17,463
Critical
1,337
High
5,864
Medium
6,249
Low
648
Severity not reported
3,365
In CISA KEV
20
Most affected vendors (by CPE data where available): microsoft (1307), google (756), oracle (156), ibm (140), adobe (138), broadcom (61), langflow (57), apache (45), freerdp (42), linuxfoundation (41)
| CVE | Severity | CVSS | KEV | Vendor / product | Published | Modified |
|---|---|---|---|---|---|---|
| CVE-2026-83903 Heap-based buffer overflow in Windows Direct Composition allows an authorized at... |
high | 7.8 | — | Microsoft / windows 11 24h2 | 2026-10-13 | 2026-10-29 |
| CVE-2026-83899 Improper privilege management in Windows Installer allows an authorized attacker... |
high | 7.0 | — | Microsoft / windows 10 1607 | 2026-10-13 | 2026-10-21 |
| CVE-2026-83896 Heap-based buffer overflow in Windows Direct Composition allows an authorized at... |
high | 7.8 | — | Microsoft / windows 10 1607 | 2026-10-13 | 2026-10-21 |
| CVE-2026-83891 Stack-based buffer overflow in Microsoft Office Word allows an unauthorized atta... |
high | 8.8 | — | Microsoft / 365 apps | 2026-10-13 | 2026-10-15 |
| CVE-2026-83886 Use after free in Windows Update Orchestrator Service allows an authorized attac... |
high | 7.0 | — | Microsoft / windows 11 23h2 | 2026-10-13 | 2026-10-21 |
| CVE-2026-83889 Release of invalid pointer or reference in DNS Server allows an authorized attac... |
high | 8.8 | — | Microsoft / windows 10 1607 | 2026-10-13 | 2026-10-16 |
| CVE-2026-83876 Use after free in Windows Shell allows an authorized attacker to elevate privile... |
high | 7.8 | — | Microsoft / windows 10 1607 | 2026-10-13 | 2026-10-21 |
| CVE-2026-83877 Integer overflow or wraparound in HID Parser Library allows an authorized attack... |
high | 7.8 | — | Microsoft / windows 10 1809 | 2026-10-13 | 2026-10-29 |
| CVE-2026-83879 Concurrent execution using shared resource with improper synchronization ('race... |
high | 7.0 | — | Microsoft / windows 10 1607 | 2026-10-13 | 2026-10-21 |
| CVE-2026-83881 Heap-based buffer overflow in Windows exFAT File System allows an authorized att... |
high | 7.8 | — | Microsoft / windows 10 1607 | 2026-10-13 | 2026-10-21 |
| CVE-2026-83882 Heap-based buffer overflow in Windows Kernel allows an authorized attacker to el... |
high | 7.8 | — | Microsoft / windows 10 1809 | 2026-10-13 | 2026-10-21 |
| CVE-2026-83883 Use after free in Windows Win32K allows an authorized attacker to elevate privil... |
high | 7.8 | — | Microsoft / windows 10 1607 | 2026-10-13 | 2026-10-21 |
| CVE-2026-83872 Incorrect conversion between numeric types in Windows TCP/IP allows an authorize... |
high | 7.8 | — | Microsoft / windows 10 1607 | 2026-10-13 | 2026-10-21 |
| CVE-2026-83873 Relative path traversal in Windows Shell allows an authorized attacker to elevat... |
high | 7.8 | — | Microsoft / windows 10 1607 | 2026-10-13 | 2026-10-21 |
| CVE-2026-83874 Heap-based buffer overflow in Windows Event Tracing allows an unauthorized attac... |
high | 8.8 | — | Microsoft / windows 10 1607 | 2026-10-13 | 2026-10-21 |
| CVE-2026-83866 Use after free in Windows Win32K allows an authorized attacker to elevate privil... |
high | 7.0 | — | Microsoft / windows 10 1607 | 2026-10-13 | 2026-10-21 |
| CVE-2026-83867 Heap-based buffer overflow in Windows Push Notifications allows an authorized at... |
high | 7.8 | — | Microsoft / windows 10 1607 | 2026-10-13 | 2026-10-21 |
| CVE-2026-83868 Concurrent execution using shared resource with improper synchronization ('race... |
high | 7.0 | — | Microsoft / windows 10 1809 | 2026-10-13 | 2026-10-29 |
| CVE-2026-83871 Heap-based buffer overflow in OpenSSH for Windows allows an authorized attacker... |
high | 7.0 | — | Microsoft / windows 10 1809 | 2026-10-13 | 2026-10-21 |
| CVE-2026-83860 Stack-based buffer overflow in Windows GDI allows an unauthorized attacker to de... |
high | 7.5 | — | Microsoft / windows 10 1607 | 2026-10-13 | 2026-10-21 |
| CVE-2026-83861 Heap-based buffer overflow in Windows Remote Desktop Protocol allows an authoriz... |
high | 7.8 | — | Microsoft / windows 10 1607 | 2026-10-13 | 2026-10-21 |
| CVE-2026-83862 Use after free in Windows Network Load Balancing allows an unauthorized attacker... |
high | 8.8 | — | Microsoft / windows 10 1607 | 2026-10-13 | 2026-10-23 |
| CVE-2026-83863 Heap-based buffer overflow in Servicing Stack Updates allows an authorized attac... |
high | 7.8 | — | Microsoft / windows 10 1607 | 2026-10-13 | 2026-10-29 |
| CVE-2026-83852 Use after free in Windows Bind Filter Driver allows an authorized attacker to el... |
high | 7.0 | — | Microsoft / windows 11 24h2 | 2026-10-13 | 2026-10-29 |
| CVE-2026-83853 Use after free in Windows Hello allows an authorized attacker to elevate privile... |
high | 7.0 | — | Microsoft / windows 10 21h2 | 2026-10-13 | 2026-10-21 |
| CVE-2026-83855 Integer underflow (wrap or wraparound) in Windows WLAN Service allows an unautho... |
high | 7.5 | — | Microsoft / windows 11 23h2 | 2026-10-13 | 2026-10-21 |
| CVE-2026-83856 Out-of-bounds read in Windows Event Logging Service allows an unauthorized attac... |
high | 8.1 | — | Microsoft / windows 11 23h2 | 2026-10-13 | 2026-10-21 |
| CVE-2026-83857 Use after free in Windows Universal Disk Format File System Driver (UDFS) allows... |
high | 7.8 | — | Microsoft / windows 10 1607 | 2026-10-13 | 2026-10-21 |
| CVE-2026-83859 Use after free in Windows NTFS allows an authorized attacker to elevate privileg... |
high | 7.8 | — | Microsoft / windows 10 1607 | 2026-10-13 | 2026-10-21 |
| CVE-2026-83845 Improper privilege management in Windows Internet (wininet.dll) allows an author... |
high | 8.4 | — | Microsoft / windows 10 21h2 | 2026-10-13 | 2026-10-29 |
| CVE-2026-83846 Use after free in Connected Devices Platform Service (Cdpsvc) allows an authoriz... |
high | 7.0 | — | Microsoft / windows 10 1809 | 2026-10-13 | 2026-10-29 |
| CVE-2026-83847 Heap-based buffer overflow in Microsoft Account allows an authorized attacker to... |
high | 7.8 | — | Microsoft / windows 10 1607 | 2026-10-13 | 2026-10-29 |
| CVE-2026-83848 Untrusted pointer dereference in Windows COM+ Event System Service allows an aut... |
high | 7.8 | — | Microsoft / windows 10 1607 | 2026-10-13 | 2026-10-29 |
| CVE-2026-83850 Heap-based buffer overflow in Microsoft Windows Search Component allows an autho... |
high | 7.8 | — | Microsoft / windows 10 1607 | 2026-10-13 | 2026-10-29 |
| CVE-2026-83851 Heap-based buffer overflow in Windows Partition Management Driver allows an unau... |
high | 8.8 | — | Microsoft / windows 10 1809 | 2026-10-13 | 2026-10-29 |
| CVE-2026-83839 Time-of-check time-of-use (toctou) race condition in Windows Hyper-V allows an a... |
high | 7.0 | — | Microsoft / windows 10 1809 | 2026-10-13 | 2026-10-27 |
| CVE-2026-83840 Weak authentication in Windows Error Reporting allows an authorized attacker to... |
high | 7.8 | — | Microsoft / windows 10 1607 | 2026-10-13 | 2026-10-27 |
| CVE-2026-83841 Concurrent execution using shared resource with improper synchronization ('race... |
high | 7.0 | — | Microsoft / windows 10 1809 | 2026-10-13 | 2026-10-27 |
| CVE-2026-83842 Double free in Windows TCP/IP allows an authorized attacker to elevate privilege... |
high | 7.0 | — | Microsoft / windows 10 1607 | 2026-10-13 | 2026-10-28 |
| CVE-2026-83843 Out-of-bounds read in Windows Internet Key Exchange (IKE) Protocol allows an una... |
high | 7.5 | — | Microsoft / windows 10 1607 | 2026-10-13 | 2026-10-28 |
Sources: NIST NVD (CVE API 2.0) and the CISA KEV catalog. Severity is as stated by the source; missing values are shown as “not reported”, never estimated.