CVE-2026-84894
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk15th percentile - higher than 15% of all known CVEs
Summary
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.
Risk Assessment
This can lead to a use-after-free condition, potentially causing a crash or code execution by a remote attacker. The vulnerability affects applications using moxygen with WebTransport.
Recommendation
Update moxygen to commit 004123dd24c3 or later. Until the update, consider restricting access to WebTransport functionality.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

