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CVE-2026-84894

Quick assessment

Affected
Meta Platforms, Inc moxygen
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 moxygen 于 commit 004123dd24c3 之前的版本中，MoQSession::dataStreamReadLoop 在读取到 FIN 后仍继续使用一个无效的流读取句柄（handle），这违反了 proxygen 的 WebTransport API 规范，导致该句柄被作废。远程对端可以通过打开一个数据流，将其名称设置为一个未知的轨道别名（track alias），并在同一写操作中携带 FIN，从而触发对此已过期句柄的无效使用。

AI Predicted 6.5 Difficulty: Moderate EPSS 0.26% · P15

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Meta Platforms, Inc moxygen b24f8e65cb83ebe5f3880cc4e3a4c8f64e1882f9< 004123dd24c30dad6b649163575145f240dabc94 affected
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I. Basic Information for CVE-2026-84894

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
In moxygen before commit 004123dd24c3, MoQSession::dataStreamReadLoop keeps using a stream read handle after reading a FIN, which invalidates the handle under proxygen's WebTransport API. A remote peer can trigger the stale use by opening a data stream that names an unknown track alias and carries the FIN in the same write.
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
Meta Platforms, Inc moxygen b24f8e65cb83ebe5f3880cc4e3a4c8f64e1882f9 ~ 004123dd24c30dad6b649163575145f240dabc94 -

II. Public POCs for CVE-2026-84894

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-84894

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Vendor Advisories for CVE-2026-84894 (1)

IV. Related Vulnerabilities

Same vendor: Meta Platforms, Inc

V. Comments for CVE-2026-84894

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