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CVE-2026-34343

⚠️ high
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Summary

Heap-based buffer overflow in Windows Application Identity (AppID) Subsystem allows an authorized attacker to elevate privileges locally.

CVSS Score
7.8
High
EPSS Score
0.0
Exploit Probability
Published Date
2026-05-12
First Seen: 2026-05-17
📊 Relative Risk Intelligence

This CVE is Moderate Risk - more severe than 68.5% of all 364,858 vulnerabilities in our database.

#114,934
Above average severity
Severity Percentile
🎯 CISA SSVC Assessment Updated: May 7, 2026
🔍 Exploitation Status
None
No known exploits
⚙️ Automatable
NO
Requires human interaction
💥 Technical Impact
Total
Complete system compromise possible
SSVC data provided by CISA
Last Modified 2026-05-14
Source NVD 🔗
CVSS Vector 3.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE IDs (Weakness Types)
CWE-122

📦 Affected Products 15

Vendor Product Status Affected Versions
microsoft windows_server_2012 Affected
v-
microsoft windows_server_2012 Affected
vr2
microsoft windows_server_2016 Affected
< 10.0.14393.9140
microsoft windows_server_2019 Affected
< 10.0.17763.8755
microsoft windows_server_2022 Affected
< 10.0.20348.5074
microsoft windows_10_1809 Affected
< 10.0.17763.8755
microsoft windows_10_21h2 Affected
< 10.0.19044.7291
microsoft windows_10_22h2 Affected
< 10.0.19045.7291
microsoft windows_10_1607 Affected
< 10.0.14393.9140
microsoft windows_11_23h2 Affected
< 10.0.22631.7079
microsoft windows_server_2022_23h2 Affected
< 10.0.25398.2330
microsoft windows_11_24h2 Affected
< 10.0.26100.8390
microsoft windows_server_2025 Affected
< 10.0.26100.32772
microsoft windows_11_25h2 Affected
< 10.0.26200.8390
microsoft windows_11_26h1 Affected
< 10.0.28000.2113

🔗 References 1

https://msrc.microsoft.com/update-guide/vulnerabilit...
Vendor Advisory

🔗 Related CVEs 6

CVE ID Severity CVSS EPSS Summary Published
CVE-2026-85921 ⚠️ high 8.2 0.4 Double free in Windows Secure Kernel Mode allows an authorized attacker to elevate privileges locally. 2026-09-14
CVE-2026-50349 ⚠️ high 7.0 0.2 Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Ancillary Functio... 2026-09-08
CVE-2026-62694 ⚠️ high 7.0 0.3 Use after free in Windows Installer allows an authorized attacker to elevate privileges locally. 2026-09-08
CVE-2026-62706 ⚠️ high 8.8 0.8 Out-of-bounds read in Microsoft Windows Media Foundation allows an unauthorized attacker to execute code over a network. 2026-09-08
CVE-2026-62759 ⚠️ high 7.5 0.4 Authentication bypass by spoofing in Windows Netlogon allows an unauthorized attacker to perform spoofing over an adjace... 2026-09-08
CVE-2026-62762 🔶 medium 6.5 1.1 Null pointer dereference in Active Directory Domain Services allows an authorized attacker to deny service over a networ... 2026-09-08
These CVEs affect the same products