🛡️ CVE-2026-54982 — windows-10-1607

🟠 CVSS 8.8 — High ✅ No Known Exploit CWE-191 NVD
8.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Integer underflow (wrap or wraparound) in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to execute code over an adjacent network.

How this vulnerability can be exploited

This issue can be reached from an adjacent network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2026-54982 is classified as CWE-191: Integer Underflow. A subtraction drops below the minimum for the type and wraps, yielding an unexpectedly large value.

Affected software

CVE-2026-54982 is recorded against 12 packages.

  • windows-10-1607 (fixed in 10.0.14393.9339)
  • windows-10-1809 (fixed in 10.0.17763.9020)
  • windows-10-21h2 (fixed in 10.0.19044.7548)
  • windows-10-22h2 (fixed in 10.0.19045.7548)
  • windows-11-24h2 (fixed in 10.0.26100.8875)
  • windows-11-25h2 (fixed in 10.0.26200.8875)
  • windows-11-26h1 (fixed in 10.0.28000.2525)
  • windows-server-2012
  • windows-server-2016 (fixed in 10.0.14393.9339)
  • windows-server-2019 (fixed in 10.0.17763.9020)
  • windows-server-2022 (fixed in 10.0.20348.5386)
  • windows-server-2025 (fixed in 10.0.26100.33158)

Timeline and source

Published on 14 July 2026 and last revised on 20 July 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

msrc.microsoft.com

Details

Severity HIGH
CVSS Score 8.8
CVSS Vector CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE CWE-191
Public Exploit ✅ No
Source NVD
Published 2026-07-14
Updated 2026-08-11
Modified 2026-07-20

Affected Packages

Software From version Fixed in
windows-10-1607 10.0.14393.9339
windows-10-1809 10.0.17763.9020
windows-10-21h2 10.0.19044.7548
windows-10-22h2 10.0.19045.7548
windows-11-24h2 10.0.26100.8875
windows-11-25h2 10.0.26200.8875
windows-11-26h1 10.0.28000.2525
windows-server-2012
windows-server-2016 10.0.14393.9339
windows-server-2019 10.0.17763.9020
windows-server-2022 10.0.20348.5386
windows-server-2025 10.0.26100.33158

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