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CVE-2026-54982: Windows Reliable Multicast Transport Driver (RMCAST) Remote Code Execution Vulnerability

highCVSS 8.8CVE-2026-54982
Integer underflow (wrap or wraparound) in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to execute code over an adjacent network.

CSIRTS triage

vendor: Microsoftproduct: Reliable Multicast Transport Driver (RMCAST)Remote code execution
What
Integer underflow in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to execute code over an adjacent network.
Who is affected
Deployments of RMCAST that are exposed to adjacent network access.
Urgency
Remediation is high urgency as this vulnerability can lead to remote code execution.
Action
Update the RMCAST driver to the latest version.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 8.8
Published
2026-07-14
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54982

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-54982coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Windows Reliable Multicast

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from Microsoft Security Response Center