In moxygen before commit 004123dd24c3, MoQSession::dataStreamReadLoop keeps using a stream read handle after reading a FIN, which invalidates the handle under proxygen's WebTransport API. A remote peer can trigger the stale use by opening a data stream that names an unknown track alias and carries the FIN in the same write.
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-84894.json"
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"2026-09-30T08:06:59Z"