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CVE-2026-91095

Quick assessment

Affected
Facebook proxygen
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 2024 年 10 月 28 日 00 时至 2026 年 9 月 28 日 00 时之间发布的 ProxyGen 版本中， 和 这两个 API 可能会返回流处理器（stream handler）已经释放的流句柄（stream handles）。随后， 会将这些句柄安装为传输层读取回调函数，从而导致已释放内存的非法访问（use of freed memory，即常见的“释放后使用”漏洞）。

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I. Basic Information for CVE-2026-91095

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Facebook proxygen v2024.10.28.00 ~ v2026.09.28.00 -

II. Public POCs for CVE-2026-91095

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III. Intelligence Information for CVE-2026-91095

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Other References for CVE-2026-91095 (2)

Same Patch Batch · Facebook · 2026-09-28 · 3 CVEs total

CVE-2026-84895 Proxygen v2026.04-09 Use-After-Free漏洞
CVE-2026-91096 Proxygen 2024.10-2026.09 远程代码执行

IV. Related Vulnerabilities

Same product: proxygen
Same vendor: Facebook

V. Comments for CVE-2026-91095

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