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CVE-2026-54995 is a remote code execution vulnerability in the Windows Reliable Multicast Transport Driver (RMCAST). The flaw is a use-after-free condition in RMCAST that can be triggered by an unauthorized attacker over the network. Microsoft rates the issue High severity with CVSS v3.1 8.1 and describes the attack vector as network-based, requiring no privileges and no user interaction, but with high attack complexity. Successful exploitation could allow arbitrary code execution on affected Windows client and server systems.
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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.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
4 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 a use-after-free condition.
Unknown
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.