CVE WatchSep 28, 2026

CVE-2026-84894

In moxygen before commit 004123dd24c3, MoQSession::dataStreamReadLoop keeps using a stream read handle after reading a FIN, which invalidate

CVSS

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No CVSS

EPSS

0.3%

p17

KEV

—

Exploit Today

0-100

Published: Sep 28, 2026 · Last modified: Sep 28, 2026

EPSS · 30d

0.1%EPSS · 30 days0.3%

2026-09-292026-10-25

Technical description

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.

Official references

github.comhttps://github.com/facebookexperimental/moxygen/commit/004123dd24c30dad6b649163575145f240dabc94
www.facebook.comhttps://www.facebook.com/security/advisories/cve-2026-84894

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