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.

Metrics

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

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Advisories

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Fixes

Solution

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Workaround

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References
Link Providers
https://github.com/facebook/proxygen/commit/479eb5574195764e80e6cedebef669f6baa85083 cve-icon cve-icon
https://www.facebook.com/security/advisories/cve-2026-84895 cve-icon cve-icon
History

Mon, 28 Sep 2026 22:45:00 +0000

Type Values Removed Values Added
Title Use‑After‑Free in Facebook Proxygen’s QUIC Session Handling Leading to Potential Code Execution
Weaknesses CWE-416

Mon, 28 Sep 2026 21:00:00 +0000

Type Values Removed Values Added
Description 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.
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Meta

Published:

Updated: 2026-09-28T20:44:34.886Z

Reserved: 2026-09-02T14:52:36.354Z

Link: CVE-2026-84895

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-09-28T21:17:19.027

Modified: 2026-09-28T21:17:19.130

Link: CVE-2026-84895

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-28T22:30:08Z

Weaknesses