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CVE-2026-62898 is a use-after-free vulnerability in Microsoft QUIC affecting .NET Windows runtime packages. Improper lifetime management in the QUIC transport layer can result in reuse of freed heap memory and permit an unauthenticated remote attacker to disclose information over the network. The issue is rated CVSS 3.1 7.5 (High): AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
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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.
16 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability affecting the identified Alpine .NET package set; the specific flaw type is not provided.
Unknown; this CVE is referenced by the Alpine security update but no vulnerability description is provided.
A use-after-free vulnerability in Microsoft QUIC that permits unauthorized information disclosure over a network.
A CVE listed in the Fedora advisory reference information without further detail in this content.
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.