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CVE-2026-84894

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 pee

Meta Platforms, Inc moxygen
Open in ThreatlineRecord JSON
CVSS
7.5High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.26%Chance of exploitation activity in the next 30 days, higher than 16% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in004123dd24c30dad6b649163575145f240dabc94Fixed versionCVE List
Published28 Sep 2026Updated 30 Sep 2026CVE List

What fixes it

  • 004123dd24c30dad6b649163575145f240dabc94moxygenCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 1

  • moxygenaffected: b24f8e65cb83ebe5f3880cc4e3a4c8f64e1882f9 before 004123dd24c30dad6b649163575145f240dabc94CVE List

References 2