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CVE-2026-62815 is a critical use-after-free vulnerability in Microsoft QUIC. A flaw in network-path creation and removal can invalidate a pointer during path promotion. An unauthenticated attacker can send a specially crafted QUIC network packet to an affected service and potentially execute arbitrary code remotely. The vulnerability has a CVSS score of 9.8 and requires neither authentication nor user interaction.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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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.
20 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A remote code execution vulnerability in Microsoft QUIC (MsQuic) caused by a use-after-free/pointer invalidation condition during incoming-packet-triggered network path creation and removal. An unauthenticated remote attacker can send a specially crafted packet to an affected service; no user interaction is required.
A Critical-severity remote code execution vulnerability in Microsoft QUIC. It is one of seven Windows-related flaws requiring no authentication or user interaction.
A critical no-authentication, no-user-interaction vulnerability affecting Microsoft QUIC.
Critical remote code execution vulnerability in Microsoft's QUIC implementation requiring no authentication or 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.