In proxygen from v2024.10.28.00 until v2026.09.28.00, the HTTPTransaction::onWebTransportUniStream and HTTPTransaction::onWebTransportBidiStream APIs could return stream handles that the stream handler had already freed. HQSession then installed those handles as transport read callbacks, which could lead to use of freed memory.

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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 Use-after-free in Facebook proxygen HTTP stream handlers
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, the HTTPTransaction::onWebTransportUniStream and HTTPTransaction::onWebTransportBidiStream APIs could return stream handles that the stream handler had already freed. HQSession then installed those handles as transport read callbacks, which could lead to use of freed memory.
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cve-icon MITRE

Status: PUBLISHED

Assigner: Meta

Published:

Updated: 2026-09-28T20:44:45.928Z

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

Link: CVE-2026-91095

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-09-28T21:17:19.170

Modified: 2026-09-28T21:17:19.273

Link: CVE-2026-91095

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-28T23:00:07Z

Weaknesses