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CVE-2026-54982 is a remote code execution vulnerability in the Windows Reliable Multicast Transport Driver (RMCAST). The flaw is caused by an integer underflow (wraparound) condition in RMCAST processing. An unauthorized attacker can exploit the vulnerability over an adjacent network without privileges or user interaction. Microsoft rates the issue as high severity with CVSS v3.1 8.8 (AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H). Affected platforms include multiple supported Windows 10, Windows 11, and Windows Server releases, including Server Core installations of several Windows Server versions.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity remote code execution vulnerability in the Windows Reliable Multicast Transport Driver (RMCAST) caused by an integer underflow (CWE-191), allowing unauthorized code execution from an adjacent network.
A remote code execution vulnerability in the Windows Reliable Multicast Transport Driver (RMCAST).
A critical remote code execution vulnerability in the Windows Reliable Multicast Transport Driver.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.