What’s Vulnerable › Vulnerabilities

CVE-2026-84894

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-28 · updated 2026-09-30
• Weakness: CWE-416

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.

References

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

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