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Issues

Support Client Migration (Client Side)
#1946 · nibanks opened on Aug 27, 2021
5

Support for OpenSSL 4
microsoft/msquic#6490 · opened on Nov 13, 2026
QuicRecvBufferResetRead() leaves RetiredChunk set: breaks the "retired chunk only while a read is pending" invariant (assert in debug, leaked chunk in release)
microsoft/msquic#6473 · opened on Nov 10, 2026
[CI - FAILURE]: / Handshake_WithConnectionPoolCreateArgs.ConnectionPoolCreate_11 (msquictest.exe)
microsoft/msquic#6471 · opened on Nov 9, 2026
OpenSSL: server never reports the early-data outcome (EarlyDataState stays UNKNOWN)
microsoft/msquic#6460 · opened on Nov 5, 2026
OpenSSL: server writes EncryptedExtensions/Finished at the Initial level when it accepts 0-RTT
microsoft/msquic#6458 · opened on Nov 5, 2026
2
QUIC_ERROR_APPLICATION_ERROR is 0xB, but RFC 9000 assigns 0x0b to INVALID_TOKEN (APPLICATION_ERROR is 0x0c)
microsoft/msquic#6456 · opened on Nov 4, 2026
[CI - FAILURE]: / ParameterValidation_WithValidateStreamEventArgs.ValidateStreamEvents_8 (msquictest.exe)
Bug
microsoft/msquic#6448 · opened on Nov 3, 2026
Lost PATH_CHALLENGE on a rebound path is never resent; server stalls at the amplification limit
Bug
microsoft/msquic#6443 · opened on Nov 1, 2026
1
Client QuicConnUpdateDestCid overwrites DestCid on subsequent Initial packets (RFC 9000 §7.2)
Bug
microsoft/msquic#6439 · opened on Oct 31, 2026
[CI - FAILURE]: / Misc.StatelessResetKey (msquictest)
Bug
microsoft/msquic#6429 · opened on Oct 28, 2026
Publish MsQuic to Azure Linux 4.0
Task
microsoft/msquic#6413 · opened on Oct 23, 2026
Client derives Initial keys from the server's SCID after a v1 server Initial, breaking compatible version negotiation to v2
Bug
microsoft/msquic#6407 · opened on Oct 20, 2026
2
[CI - FAILURE]: / Basic.TestVersionStorage (msquictest.exe)
Bug
microsoft/msquic#6392 · opened on Oct 13, 2026
Update reliable reset to current RESET_STREAM_AT wire format for interoperability
Task
microsoft/msquic#6376 · opened on Oct 12, 2026
2
Listener close does not release the UDP endpoint synchronously: deferred socket close on kqueue/epoll, and bindings kept by connections until QuicConnFree
Bug
microsoft/msquic#6374 · opened on Oct 11, 2026
1
[CI - FAILURE]: / PlatformTest.EventQueueWorker (msquicplatformtest.exe)
Bug
microsoft/msquic#6368 · opened on Oct 7, 2026
[Crates.IO] When will you be restarting publishing updates on crates.io
Task
microsoft/msquic#6366 · opened on Oct 6, 2026
1
DOS_MODE_CHANGED callback can deadlock when calling ListenerStop
Bug
microsoft/msquic#6361 · opened on Oct 5, 2026
Custom Execution / Processor Map: Connection dispatch collapses to a single partition causing severe worker imbalance
Bug
microsoft/msquic#6353 · opened on Oct 1, 2026
Use new parameter to return BufferLength
Task
microsoft/msquic#6348 · opened on Sep 30, 2026
App verifier must be used to validate test passes
Task
microsoft/msquic#6347 · opened on Sep 29, 2026
1
After a peer IP migration, a datagram-using connection spins and stops sending: PathId is never recorded on sent packets, the datagram limit is not recomputed on a path switch, and old-path losses throttle the new path's congestion window
Bug
microsoft/msquic#6339 · opened on Sep 27, 2026
1
ACK_FREQUENCY: max_ack_delay ratchets up by the timer resolution on every exchange, and PTO keeps using the handshake max_ack_delay
Bug
microsoft/msquic#6334 · opened on Sep 25, 2026
0-RTT rejection after reduced initial_max_data can underflow connection flow-control accounting and emit over-limit STREAM bytes
Bug
microsoft/msquic#6311 · opened on Sep 7, 2026
3
RegistrationClose frees a QUIC_WORKER_POOL while IsExternal workers' ExecutionContexts are still linked into the external CXPLAT_WORKER_POOL, when MsQuicLib.CustomExecutions is set
microsoft/msquic#6308 · opened on Sep 5, 2026