CVE-2026-91096
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 v2024.10.28.00 至 v2026.09.28.00 版本的 proxygen 中， （在 v2025.08.18.00 之前的版本中称为 ）在销毁不再开放的流之前，未能注销这些流的读取回调。这可能导致传输层调用一个已被释放的读取回调。
Possible ATT&CK Techniques 1 AI
T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2026-91096
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, 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.
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
II. Public POCs for CVE-2026-91096
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Other References for CVE-2026-91096 (2)
-
https://www.facebook.com/security/advisories/cve-2026-91096 x_refsource_CONFIRM
Same Patch Batch · Facebook · 2026-09-28 · 3 CVEs total
| CVE-2026-84895 | Proxygen v2026.04-09 Use-After-Free漏洞 | |
| CVE-2026-91095 | Proxygen v2024.10.28.0至v2026.09.28.00内存释放后使用漏洞 |
IV. Related Vulnerabilities
Same vendor: Facebook
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CVE-2026-91095
Proxygen v2024.10.28.0至v2026.09.28.00内存释放后使用漏洞 -
CVE-2026-84895
Proxygen v2026.04-09 Use-After-Free漏洞 -
CVE-2026-66707
WordPress Facebook for WooCommerce plugin <= 3.7.5 - Cross S -
CVE-2026-66705
WordPress Facebook for WordPress plugin <= 5.2.1 - Cross Sit -
CVE-2026-44909
Facebook proxygen 资源管理错误漏洞
V. Comments for CVE-2026-91096
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