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CVE-2026-41210— Moonlight Qt: Remote heap buffer overflow in Moonlight Qt H.264 SPS fixup path via crafted seq_parameter_set_id

Quick assessment

Affected
moonlight-stream moonlight-qt
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.

Moonlight Qt 是一款适用于 Windows、macOS、Linux 和 Steam Link 的 GameStream 客户端。在 6.1.0 及更早版本中，当受害者向恶意主机发起串流会话后，若 Moonlight 选择了未声明 能力的解码路径，主机可发送构造的 H.264 SPS（序列参数集）NAL 单元。在 中的 SPS 修复处理路径会使用 库解析服务器提供的数据，其中由攻击者控制的 被用作 （大小为 32 项的数组）的索引，且未进行有效性验证。当该值大于或等于 32 时，会导致越界写入，从而在 M

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-41210

Vulnerability Information
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Vulnerability Title
Moonlight Qt: Remote heap buffer overflow in Moonlight Qt H.264 SPS fixup path via crafted seq_parameter_set_id
Source: CVE Program / CVE List V5
Vulnerability Description
Moonlight Qt is a GameStream client for Windows, macOS, Linux, and Steam Link. In version 6.1.0 and earlier, after a victim initiates a streaming session to a malicious host, the host can send a crafted H.264 SPS NAL when Moonlight selects a decoder path that does not advertise CAPABILITY_REFERENCE_FRAME_INVALIDATION_AVC. The SPS fixup path in app/streaming/video/ffmpeg.cpp parses the server-provided data with h264bitstream, where attacker-controlled seq_parameter_set_id is used to index the 32-entry sps_table without validation. A value of 32 or greater causes an out-of-bounds write and remote heap corruption in the Moonlight client. The demonstrated impact is a reliable client crash, while code execution is not established. This issue is fixed in version 6.2.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
moonlight-stream moonlight-qt < 6.2.0 -

II. Public POCs for CVE-2026-41210

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III. Intelligence Information for CVE-2026-41210

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Patches & Fixes for CVE-2026-41210 (1)

Vendor Advisories for CVE-2026-41210 (1)

Vendor Pages for CVE-2026-41210 (1)

IV. Related Vulnerabilities

Same vendor: moonlight-stream
Same weakness: CWE-787

V. Comments for CVE-2026-41210

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