MetaCVE-2026-84894
Meta moxygen: use after free
High7.5CVE-2026-84894 · Published Sep 28, 2026 · updated Sep 30, 2026
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.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| moxygen Product | >= b24f8e65cb83ebe5f3880cc4e3a4c8f64e1882f9, < 004123dd24c30dad6b649163575145f240dabc94 | 004123dd24c30dad6b649163575145f240dabc94 |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Severity from
- CISA (its enrichment of the CVE record)
- Weakness
- CWE-416
More Meta advisories
All Meta| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Sep 30 | Prior to v74.0.0.878.1682 of Meta Horizon OS | Critical9.1 | v74.0.0.878.1682 |
| Sep 30 | Prior to v66.0.0.733.524 of Meta Horizon OS | High8.8 | v66.0.0.733.524 |
| Sep 28 | Meta proxygen: use after free | High7.3 | v2026.09.28.00 |
| Sep 28 | Meta proxygen: use after free | Medium5.3 | v2026.09.28.00 |
| Sep 28 | Meta proxygen: use after free | High7.5 | v2026.09.28.00 |
| Jul 23 | Meta proxygen: resource exhaustion | High7.5 | v2026.07.20.00 |