🛡️ CVE-2026-42903 — windows-10-1607

🟡 CVSS 6.5 — Medium ✅ No Known Exploit CWE-476 NVD
6.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Null pointer dereference in Windows Kerberos allows an authorized attacker to deny service over a network.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Weakness class

CVE-2026-42903 is classified as CWE-476: NULL Pointer Dereference. A pointer that can be null is used without a check, crashing the process.

Affected software

CVE-2026-42903 is recorded against 14 packages.

  • unknown
  • windows-10-1607 (fixed in 10.0.14393.9234)
  • windows-10-1809 (fixed in 10.0.17763.8880)
  • windows-10-21h2 (fixed in 10.0.19044.7417)
  • windows-10-22h2 (fixed in 10.0.19045.7417)
  • windows-11-23h2 (fixed in 10.0.22631.7219)
  • windows-11-24h2 (fixed in 10.0.26100.8655)
  • windows-11-25h2 (fixed in 10.0.26200.8655)
  • windows-11-26h1 (fixed in 10.0.28000.2269)
  • windows-server-2012
  • windows-server-2016 (fixed in 10.0.14393.9234)
  • windows-server-2019 (fixed in 10.0.17763.8880)
  • windows-server-2022 (fixed in 10.0.20348.5256)
  • windows-server-2025 (fixed in 10.0.26100.32995)

Timeline and source

Published on 9 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

msrc.microsoft.com

Details

Severity MEDIUM
CVSS Score 6.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE CWE-476
Public Exploit ✅ No
Source NVD
Published 2026-06-09
Updated 2026-08-11
Modified 2026-06-09
Fix URL N/A

Affected Packages

Software From version Fixed in
unknown
windows-10-1607 10.0.14393.9234
windows-10-1809 10.0.17763.8880
windows-10-21h2 10.0.19044.7417
windows-10-22h2 10.0.19045.7417
windows-11-23h2 10.0.22631.7219
windows-11-24h2 10.0.26100.8655
windows-11-25h2 10.0.26200.8655
windows-11-26h1 10.0.28000.2269
windows-server-2012
windows-server-2016 10.0.14393.9234
windows-server-2019 10.0.17763.8880
windows-server-2022 10.0.20348.5256
windows-server-2025 10.0.26100.32995

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