Meta ProxyGen v2024.10.28v2026.09.28: WebTransportImpl Read Callback Leak
CVE-2026-91096 Published on September 28, 2026
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.
Vulnerability Analysis
CVE-2026-91096 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.
Weakness Type
What is a Dangling pointer Vulnerability?
Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.
CVE-2026-91096 has been classified to as a Dangling pointer vulnerability or weakness.
Products Associated with CVE-2026-91096
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Affected Versions
Facebook proxygen:- Version v2024.10.28.00 and below v2026.09.28.00 is affected.