Issues

• Lost PATH_CHALLENGE on a rebound path is never resent; server stalls at the amplification limit

  microsoft/msquic#6443 · Filter by author jbevemyr opened on Nov 1, 2026
  1

• Client QuicConnUpdateDestCid overwrites DestCid on subsequent Initial packets (RFC 9000 §7.2)

  microsoft/msquic#6439 · Filter by author HeartyYF opened on Oct 31, 2026

• [CI - FAILURE]: / ParameterValidation.ValidateExecutionContext (msquictest)

  bvtci-failure
  microsoft/msquic#6438 · Filter by author github-actions opened on Oct 30, 2026

• [CI - FAILURE]: BVT-Release-linux-ubuntu-26.04-x64-openssl-UseIoUring-UseSystemOpenSSLCrypto / ParameterValidation.ValidateExecutionContext (msquictest)

  bvtci-failure
  microsoft/msquic#6434 · Filter by author github-actions opened on Oct 28, 2026
  1

• [CI - FAILURE]: BVT-Debug-linux-ubuntu-24.04-x64-quictls-UseIoUring-UseSystemOpenSSLCrypto / ParameterValidation.ValidateExecutionContext (msquictest)

  bvtci-failure
  microsoft/msquic#6433 · Filter by author github-actions opened on Oct 28, 2026

• [CI - FAILURE]: / Misc.StatelessResetKey (msquictest)

  bvtci-failure
  microsoft/msquic#6429 · Filter by author github-actions opened on Oct 28, 2026

• path: DestCid lifecycle edge cases in QuicPathRemove and QuicPathUpdateDestCids

  Area: Core
  Bug

  microsoft/msquic#6416 · Filter by author imgolamrabbani opened on Oct 24, 2026
  2

  

• Publish MsQuic to Azure Linux 4.0

  Area: Packaging
  Task

  microsoft/msquic#6413 · Filter by author gaurav2699 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

  Area: Corehelp wanted
  Bug

  microsoft/msquic#6407 · Filter by author cpkb-bluezoo opened on Oct 20, 2026
  2

• [CI - FAILURE]: / Basic.TestVersionStorage (msquictest.exe)

  bvtci-failure
  Bug

  microsoft/msquic#6392 · Filter by author github-actions opened on Oct 13, 2026
  

• Update reliable reset to current RESET_STREAM_AT wire format for interoperability

  Area: Core
  Task

  microsoft/msquic#6376 · Filter by author WilliamSmithEdward 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

  Area: Platformhelp wanted
  Bug

  microsoft/msquic#6374 · Filter by author WilliamSmithEdward opened on Oct 11, 2026
  1

• [CI - FAILURE]: / PlatformTest.EventQueueWorker (msquicplatformtest.exe)

  bvtci-failure
  Bug

  microsoft/msquic#6368 · Filter by author github-actions opened on Oct 7, 2026
  

• [Crates.IO] When will you be restarting publishing updates on crates.io

  Area: Packaginghelp wanted
  Task

  microsoft/msquic#6366 · Filter by author DEKHTIARJonathan opened on Oct 6, 2026
  1

• DOS_MODE_CHANGED callback can deadlock when calling ListenerStop

  Area: APIArea: Core
  Bug

  microsoft/msquic#6361 · Filter by author gaurav2699 opened on Oct 5, 2026
  

• release/2.5 is missing the connection-pool data race fix (#6114) that was backported to release/2.6

  Task

  microsoft/msquic#6360 · Filter by author matte1782 opened on Oct 3, 2026
  

• Custom Execution / Processor Map: Connection dispatch collapses to a single partition causing severe worker imbalance

  Area: CoreArea: Lola
  Bug

  microsoft/msquic#6353 · Filter by author srsubra opened on Oct 1, 2026
  

• Use new parameter to return BufferLength

  TLS: OpenSSL
  Task

  microsoft/msquic#6348 · Filter by author Santhosha-bk opened on Sep 30, 2026
  

• App verifier must be used to validate test passes

  Area: Testing
  Task

  microsoft/msquic#6347 · Filter by author guhetier 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

  Area: Core
  Bug

  microsoft/msquic#6339 · Filter by author f1kenner 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 · Filter by author f1kenner 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 · Filter by author evgind 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 · Filter by author srsubra opened on Sep 5, 2026
  

• [CI - FAILURE]: / AppData_WithSendArgs.Send_134 (msquictest)

  bvtci-failure
  Bug

  microsoft/msquic#6290 · Filter by author github-actions opened on Sep 1, 2026
  1

  

• [CI - FAILURE]: / Handshake_WithHandshakeArgs4.RandomLossResume_1 (msquictest.exe)

  bvtci-failure
  Bug

  microsoft/msquic#6278 · Filter by author github-actions opened on Aug 28, 2026
  1