In proxygen from v2024.10.28.00 until v2026.09.28.00, WebTransportImpl::terminateSessionStreams (WebTransportImpl::destroy in releases before v2025.08.18.00) failed to unregister read callbacks for streams that were no longer open before destroying them. The transport could then invoke a read callback that had been freed.
History

Thu, 01 Oct 2026 04:30:00 +0000

Type Values Removed Values Added
Title Potential Use‑After‑Free in WebTransport Session Destruction

Wed, 30 Sep 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 28 Sep 2026 23:15:00 +0000

Type Values Removed Values Added
First Time appeared Facebook
Facebook proxygen
Vendors & Products Facebook
Facebook proxygen

Mon, 28 Sep 2026 23:00:00 +0000

Type Values Removed Values Added
Title Potential Use‑After‑Free in WebTransport Session Destruction
Weaknesses CWE-416

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

Type Values Removed Values Added
Description In proxygen from v2024.10.28.00 until v2026.09.28.00, WebTransportImpl::terminateSessionStreams (WebTransportImpl::destroy in releases before v2025.08.18.00) failed to unregister read callbacks for streams that were no longer open before destroying them. The transport could then invoke a read callback that had been freed.
References

cve-icon MITRE

Status: PUBLISHED

Assigner: Meta

Published: 2026-09-28T20:44:57.363Z

Updated: 2026-09-30T19:47:55.479Z

Reserved: 2026-09-14T18:40:39.036Z

Link: CVE-2026-91096

cve-icon Vulnrichment

Updated: 2026-09-30T19:47:46.116Z

cve-icon NVD

Status : Deferred

Published: 2026-09-28T21:17:19.313

Modified: 2026-09-30T20:17:36.637

Link: CVE-2026-91096

cve-icon Redhat

No data.