Sunshine crashes with 0xc0000005 immediately after New streaming session started (RTSP handshake fails)

[dfsgdgsdgdg]

Is there an existing issue for this?

• I have searched the existing issues

Is your issue described in the documentation?

• I have read the documentation

Is your issue present in the latest beta/pre-release?

• This issue is present in the latest pre-release

Describe the Bug

Sunshine crashes with ACCESS_VIOLATION (0xc0000005) as soon as a Moonlight client launches a stream. Pairing and applist work. The last useful log line is New streaming session started [active sessions: 1], then the process dies and SunshineService restarts it.

Moonlight then fails the RTSP handshake with a connection reset:

• Moonlight Qt on the same PC (127.0.0.1): error 10054
• Moonlight iOS: error 54
• Moonlight on Samsung Tizen TV: error 15

Reproduction:

1. Install Sunshine (tested v2026.516.143833 and v2025.924.154138)
2. Pair Moonlight
3. Launch Desktop
4. Sunshine crashes; client shows RTSP handshake failure

Expected Behavior

Stream starts normally and RTSP handshake completes.

Additional Context

Crash still happens after these mitigations:

• Firewall disabled
• LAN encryption disabled + re-pair via localhost
• encoder = software (libx264)
• stream_audio = disabled
• nvenc_realtime_hags = disabled, system_tray = disabled
• HAGS disabled
• Resolution changed from 2560x1080 to 1920x1080
• NVIDIA driver rollback from 610.88 to 572.83
• Reproduced on localhost Moonlight (not a remote/network-only issue)

Windows fault details:

• Faulting application: Sunshine.exe
• Exception: 0xc0000005
• Fault offset on v2025.924.154138: 0x00000000000abcb2
• Fault offset on v2026.516.143833: 0x00000000000c067f

Minidumps exist under %LOCALAPPDATA%\CrashDumps\sunshine.exe.*.dmp (can upload on request). Example from the original Sunshine session: sunshine.exe.23972.dmp.

Host Operating System

Windows

Operating System Version

Windows 11 Pro 25H2 (build 26200)

Architecture

amd64/x86_64

Sunshine commit or version

v2026.516.143833 and v2025.924.154138

Package

Windows - msi installer (recommended)

GPU Type

NVIDIA

GPU Model

NVIDIA GeForce RTX 3060

GPU Driver/Mesa Version

Reproduced on Game Ready 610.88 and 572.83

Capture Method

Desktop Duplication API (Windows)

Config

nvenc_realtime_hags = disabled
system_tray = disabled
encoder = software
stream_audio = disabled
hevc_mode = 0
av1_mode = 0
lan_encryption_mode = 0

Also crashed with default/empty config.

Apps

Default Desktop app from stock apps.json.

Online logs

• Created public gist sunshine-crash-excerpt.log https://gist.github.com/dfsgdgsdgdg/46f61a9b68b636a72c8d2841b81ed2ad