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[release/8.0-staging] [QUIC] Update MsQuic to the latest 2.5 version#130356

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[release/8.0-staging] [QUIC] Update MsQuic to the latest 2.5 version#130356
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@ManickaP ManickaP commented Jul 8, 2026

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Description

Backport of #130173. Updates MsQuic from 2.4.18 to the latest supported 2.5 release (2.5.9) by bumping MicrosoftNativeQuicMsQuicSchannelVersion in eng/Versions.props.

main PR #130173

Customer Impact

The MsQuic 2.4 branch is being phased out and will no longer receive servicing/security updates. Staying on 2.4.18 leaves QUIC/HTTP3 consumers on an unsupported native dependency, missing bug and security fixes shipped in the actively supported 2.5 branch.

Regression

No. This is a native dependency version update, not a regression fix.

Testing

Standard CI (System.Net.Quic and HTTP/3 test suites) against the updated MsQuic package.

Risk

Low. Single version-property change consuming an already-shipping, actively-supported MsQuic 2.5.x package. 2.5 is the currently supported servicing branch for MsQuic.

Note

This PR was generated with the assistance of GitHub Copilot.

Backport of dotnet#130173 to release/8.0-staging.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot AI review requested due to automatic review settings July 8, 2026 13:23
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Pull request overview

Backport of #130173 to the release/8.0-staging branch to move the QUIC native dependency (MsQuic) from the 2.4 servicing line to the latest supported 2.5 release, keeping System.Net.Quic / HTTP/3 consumers on a supported and serviced MsQuic branch.

Changes:

  • Bump MicrosoftNativeQuicMsQuicSchannelVersion from 2.4.18 to 2.5.9 in eng/Versions.props.

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