ONNX Runtime v1.27.1

This is a patch release on top of v1.27.0, containing targeted bug fixes, a CUDA QMoE decode-path optimization, and CI/build infrastructure fixes.

Bug Fixes

• [MLAS] Fixed an igemm regression in the KleidiAI path (#28571)
• Fixed a QMoE CPU livelock by eliminating nested intra-op parallelism (#29081)
• Fixed a regression in graph-capture session initialization that rejected an empty graph (#29457)
• Fixed CustomOp forward compatibility by capping the version instead of rejecting it (#29574)

Performance

NVIDIA CUDA EP

• Added a QMoE GEMV fast path for batch-1 decode (#29038)

CI & Build Infrastructure

• Fixed an incorrect identity for azcopy (#29274)
• Fixed a brew install applesimutils failure by trusting the wix/brew tap (#29450)
• Upgraded to Xcode 26 (#29468)
• Stopped echoing the command when setting a VSO variable in mac-cpu-packing-jobs.yml (#29575)
• Fixed the web e2e (npm/vite) and Python DML CI pipelines (#29609)

Contributors

Thanks to our 8 contributors for this release!

@tianleiwu, @chilo-ms, @edgchen1, @adrastogi, @damdoo01-arm, @JonathanC-ARM, @martin-klacer-arm, @sanaa-hamel-microsoft

Full Changelog: v1.27.0...v1.27.1