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CVE-2026-62815 is a critical remote code execution vulnerability in Microsoft QUIC caused by a use-after-free condition. The flaw affects Microsoft’s implementation of the QUIC network transport protocol and can be triggered remotely by sending specially crafted network traffic to a vulnerable QUIC-exposed service. Available reporting indicates the vulnerability is exploitable without authentication and without user interaction, making it a high-risk server-side memory corruption issue.
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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.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical remote code execution vulnerability in Microsoft QUIC reachable via unauthenticated network attack.
A remote code execution vulnerability affecting Microsoft QUIC.
A critical remote code execution vulnerability in Microsoft's implementation of the QUIC network transport protocol that requires neither authentication nor user interaction.
A remote unauthenticated remote code execution vulnerability in Microsoft's QUIC transport protocol implementation requiring no user interaction.
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.