MetaCVE-2026-84895
Meta proxygen: use after free
High7.3CVE-2026-84895 · Published Sep 28, 2026 · updated Oct 1, 2026
In proxygen from v2026.04.06.00 until v2026.09.28.00, QuicWtSession::closeSession accesses its member fields after calling the base QuicWtSessionBase::closeSession method. The base method notifies the session handler, which may release the last reference to the session and destroy it.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| proxygen Product | >= v2026.04.06.00, < v2026.09.28.00 | v2026.09.28.00 |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
- 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 | Medium5.3 | v2026.09.28.00 |
| Sep 28 | Meta proxygen: use after free | High7.5 | v2026.09.28.00 |
| Sep 28 | Meta moxygen: use after free | High7.5 | 004123dd24c30dad6b649163575145f240dabc94 |
| Jul 23 | Meta proxygen: resource exhaustion | High7.5 | v2026.07.20.00 |