mozilla/neqo

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Neqo, the Mozilla Firefox implementation of QUIC in Rust

Stars: 2.2k
Forks: 172
Open beginner issues: 0
Indexed issues: 124
Avg merge: 1d 5h
Merged PRs (30d): 62

Dominant language: Rust
License: Apache-2.0
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 19, 2026
Contributing guide: No contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted good first issue

Beginner friendly Everything

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124 open issues indexed

QPACK encoder computes `MaxEntries` from locally-clamped capacity Open

Difficulty 3/5 1-2 days Newbie friendliness 70/100

mozilla/neqo#3973 · Opened Sep 11, 2026
WebTransport: require peer `reset_stream_at` once widely deployed Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

mozilla/neqo#3917 · Opened Sep 1, 2026
Disable ECN on 100% CE Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

mozilla/neqo#3820 · Opened Jul 19, 2026
Allow prioritizing DATAGRAM frames relative to STREAM data Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

mozilla/neqo#3813 · Opened Jul 16, 2026
Disable lenient parsing for remembered transport parameters in 0-RTT Open

server-side

Difficulty 4/5 3-5 days Newbie friendliness 45/100

mozilla/neqo#3786 · Opened Jul 6, 2026
Should we expose QPack limit overflow in stats? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

mozilla/neqo#3784 · Opened Jul 6, 2026
After #3765 merges, use `div_floor() Open

Difficulty 2/5 1-3 hours Newbie friendliness 48/100

mozilla/neqo#3766 · Opened Jun 29, 2026
Consider making it possible to show trace logs with Firefox release build Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

mozilla/neqo#3764 · 3 comments · Opened Jun 26, 2026
Update RESET_STREAM_AT qlog frame Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

mozilla/neqo#3757 · Opened Jun 25, 2026
Implement receive-side WebTransport per-session stream flow control (draft-15 §5.6.2) Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

mozilla/neqo#3751 · Opened Jun 24, 2026
Minor nits in the sendGroup landing Open

mozilla/neqo#3748 · 1 assignee · Opened Jun 24, 2026
Follow-on for #3467 Open

mozilla/neqo#3747 · 1 assignee · Opened Jun 24, 2026
Review logic in #1109 Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

mozilla/neqo#3685 · 2 comments · Opened Jun 10, 2026
Move WebTransport stats from SessionStats to session::Stats... Open

Difficulty 3/5 1-2 days Newbie friendliness 78/100

mozilla/neqo#3666 · Opened Jun 2, 2026
`self.congestion_control.bytes_for_cwnd_increase` should return the `cwnd` increase Open

Difficulty 3/5 1-2 days Newbie friendliness 52/100

mozilla/neqo#3655 · 2 reactions · Opened May 28, 2026
`STREAM_DATA_BLOCKED` and `DATA_BLOCKED` sent prematurely? Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

mozilla/neqo#3645 · 4 comments · Opened May 22, 2026
ACK frames are unnecessarily limited to 32 ranges Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

mozilla/neqo#3641 · 2 comments · Opened May 20, 2026
Get rid of draft-29? Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

mozilla/neqo#3623 · 2 comments · Opened May 18, 2026
Enable `webtransport` interop tests in CI Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

mozilla/neqo#3605 · Opened May 12, 2026
type that converts to `u64` or `usize` without error Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

mozilla/neqo#3593 · Opened May 8, 2026
Build Issues Open

Difficulty 3/5 1-2 days Newbie friendliness 30/100

mozilla/neqo#3565 · 6 comments · Opened Apr 16, 2026
Investigate early slow start exits, random loss and loss while underutilized Open

congestion-control

mozilla/neqo#3526 · 2 comments · 1 assignee · Opened Apr 3, 2026
Path degradation migration Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

mozilla/neqo#3484 · Opened Mar 17, 2026
OS network change events Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

mozilla/neqo#3483 · Opened Mar 17, 2026
chore(cc): refactor and simplify congestion control code Open

congestion-control

Difficulty 4/5 3-5 days Newbie friendliness 35/100

mozilla/neqo#3453 · Opened Mar 13, 2026
Small improvement to set_max_stream_data() Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

mozilla/neqo#3381 · 2 comments · Opened Feb 3, 2026
webtransport: allow new streams in parallel to CONNECT req Open

p3 task-medium

Difficulty 4/5 3-5 days Newbie friendliness 42/100

mozilla/neqo#3376 · Opened Jan 30, 2026
Huge memory allocation pattern differences during benches Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

mozilla/neqo#3344 · 1 reaction · Opened Jan 22, 2026
Trigger ECN and PMTUD validations on the same conditions Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

mozilla/neqo#3201 · Opened Dec 3, 2025
Fix when MSRV>=1.93 Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

mozilla/neqo#3193 · Opened Dec 1, 2025
Investivate bit-packing the hashmap key in `ClassicCongestionControl::maybe_lost_packets` Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

mozilla/neqo#3164 · Opened Nov 25, 2025
transport/cc: investigate more CWND reduction on Slow Start exit to avoid multiple losses Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

mozilla/neqo#3162 · 6 comments · 1 reaction · Opened Nov 24, 2025
transport: consider lower pacing rate in congestion avoidance Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

mozilla/neqo#3114 · 2 comments · Opened Nov 6, 2025
Should Neqo implement ORIGIN extension? Open

question

Difficulty 4/5 3-5 days Newbie friendliness 45/100

mozilla/neqo#3103 · Opened Nov 3, 2025
CUBIC update to RFC9438 leftovers Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

mozilla/neqo#3053 · 1 reaction · Opened Oct 15, 2025
Examine usage and conversion of `f64` values in CUBIC code Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

mozilla/neqo#3022 · 1 comment · Opened Sep 29, 2025
Enhance congestion control testing/evaluation Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

mozilla/neqo#2986 · Opened Sep 15, 2025
CUBIC app limited behavior is not fully tested Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

mozilla/neqo#2955 · 1 comment · Opened Sep 8, 2025
Q: Why not send PMTUD probe in coalesced packet? Open

bug help wanted

Difficulty 4/5 3-5 days Newbie friendliness 35/100

mozilla/neqo#2917 · 1 comment · Opened Aug 31, 2025
webtransport: `DataReadable` event on new unreadable stream Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

mozilla/neqo#2916 · Opened Aug 30, 2025
Investigate CC issues w/CUBIC Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

mozilla/neqo#2907 · 1 reaction · Opened Aug 26, 2025
Add a test with TLS HelloRetryRequest Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

mozilla/neqo#2882 · Opened Aug 19, 2025
`webtransport_session.rs` has low coverage Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

mozilla/neqo#2879 · Opened Aug 19, 2025
We sometimes increase the congestion window by 2*mss going against RFC 9002 Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

mozilla/neqo#2875 · 2 comments · Opened Aug 18, 2025
Implement modern Slow Start algorithm Open

mozilla/neqo#2858 · 1 reaction · 1 assignee · Opened Aug 15, 2025
`disable-random` not fully working Open

bug help wanted

Difficulty 4/5 3-5 days Newbie friendliness 35/100

mozilla/neqo#2855 · Opened Aug 15, 2025
Update WebTransport implementation from draft 4 to latest Open

help wanted p2 task-large

Difficulty 4/5 3-5 days Newbie friendliness 48/100

mozilla/neqo#2795 · 1 comment · 1 reaction · Opened Jul 16, 2025
Review uses of `SmallVec` Open

good first issue help wanted

Difficulty 4/5 3-5 days Newbie friendliness 45/100

mozilla/neqo#2781 · 7 comments · Opened Jul 5, 2025
Use more `NonZero` types Open

good first issue help wanted

Difficulty 5/5 Over a week Newbie friendliness 20/100

mozilla/neqo#2768 · 1 reaction · Opened Jun 30, 2025
Add test for prioritization scheme depends on in-order progress Open

good first issue help wanted

Difficulty 3/5 1-2 days Newbie friendliness 42/100

mozilla/neqo#2765 · 1 comment · Opened Jun 30, 2025

mozilla/neqo

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