Curated issues

C++ Good First Issues

Browse open source issues tagged with C++ in the issue metadata. Results stay focused on work that can become public contribution evidence.

C++

What this list is like

Average annotated difficulty: 3.9/5 across 252,632 issues.
6% of 252,632 time estimates are one day or less.

About C++

C with classes, templates and a large standard library (Bjarne Stroustrup, 1985), used wherever performance and control matter most.

Beginner friendly Everything

Open All

Eval bug: SIGSEGV in token-counting routes when the request arrives while the server is sleeping (stale vocab/mctx captured before the wake barrier) Open

Difficulty 2/5 1-3 hours Newbie friendliness 86/100

ggml-org/llama.cpp#29188 · Opened Sep 20, 2026
Sensor initialization takes very long when `--initial-sim-time` is set to current UNIX timestamp Open

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

gazebosim/gz-sensors#662 · 1 comment · Opened Sep 20, 2026
Aligned columns on the serial monitor while keeping CSV on the SD card Open

enhancement

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

NorthernWidget/Margay_Library#31 · Opened Sep 20, 2026
v1 manifest list: existing_files_count is the table-wide total-data-files Open

comp-datalake

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

ClickHouse/ClickHouse#121222 · Opened Sep 20, 2026
Case collision between `Canvas` and `canvas` test directories causes platform-dependent source hashes Open

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

LadybirdBrowser/ladybird#12123 · Opened Sep 20, 2026
[adam] AdamNet network read doesn't cap to MAX_ADAM_PACKET_LEN, overflows client receive buffers Open

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

FujiNetWIFI/fujinet-firmware#1649 · 2 comments · Opened Sep 20, 2026
Nothing cross-checks counts.json against presets.json Open

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

JimAKennedy/poly#320 · Opened Sep 20, 2026
Misc. bug: pyproject.toml: uv sync fails on macOS due to unconditional PyTorch CPU index Open

bug-unconfirmed

Difficulty 1/5 Under an hour Newbie friendliness 90/100

ggml-org/llama.cpp#29176 · Opened Sep 20, 2026
diff_drive_controller keeps warning about a timed-out velocity command while the robot is parked Open

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

ros-controls/ros2_controllers#2619 · Opened Sep 20, 2026
Crash (SIGSEGV) in sound_coreaudio::build_device_list() on macOS with audio devices reporting >66 unlabeled channels (e.g. RME Fireface UFX III) Open

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

mamedev/mame#16195 · 2 comments · Opened Sep 20, 2026
[AI][Bug][Ascend] Peak reset clears live allocator counters Open

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

flagos-ai/Torch-FL#362 · Opened Sep 20, 2026
Bug: C++ tests fail with GCC 16 due to deprecated headers Open

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

j178/leetgo#424 · Opened Sep 20, 2026
Back-quotes dropped from a GROUP BY key named `cube`/`rollup` and a CTE named `recursive`: the stored view definition does not parse back and server startup fails Open

comp-sql-syntax minor

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

ClickHouse/ClickHouse#121170 · Opened Sep 20, 2026
Memory leak in cv::glob() on WinRT/_WIN32_WCE Open

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

opencv/opencv#30004 · 1 comment · Opened Sep 20, 2026
[core][gcs] HandleReportAutoscalingState success callback reads a stack local after return (stack-use-after-return) Open

community-backlog core stability

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

ray-project/ray#66333 · Opened Sep 20, 2026
[core][gcs] GCS crashes on UpdateWorkerDebuggerPort/UpdateWorkerNumPausedThreads for an unknown worker Open

community-backlog core stability

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

ray-project/ray#66331 · Opened Sep 20, 2026
[core][gcs] HandleUnregisterNode does not reply when the node is already removed, hanging the raylet Open

community-backlog core stability

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

ray-project/ray#66329 · Opened Sep 20, 2026
ttnn.selu: the registered golden ignores the op's own scale= and alpha= kwargs, returning standard SELU — up to 3416% off while PCC stays above 0.99 Open

bug community

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

tenstorrent/tt-metal#57116 · 1 comment · Opened Sep 20, 2026
ttnn.sum/mean/max/min/std/var: the registered reduction goldens silently drop the `scalar=` kwarg, so the reference is off by up to 300% at PCC 1.0 Open

bug community op_cat: reduces

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

tenstorrent/tt-metal#57115 · 1 comment · Opened Sep 20, 2026
Chunked-prefill determinism skip runs after weight load and trace capture Open

Difficulty 1/5 Under an hour Newbie friendliness 85/100

tenstorrent/tt-metal#57112 · Opened Sep 20, 2026
KdaState._zeros holds a full duplicate carry per KDA layer Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

tenstorrent/tt-metal#57110 · Opened Sep 20, 2026
HapkeLROC silently binds a Parameters group to the wrong band when the FROM cube's BandBin/Center has duplicate values Open

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

DOI-USGS/ISIS3#6164 · Opened Sep 20, 2026
COPY ... STDIN/STDOUT (options) fails when `WITH` keyword is omitted Open

comp-sql-syntax

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

ClickHouse/ClickHouse#121150 · Opened Sep 20, 2026
1 test fails Open

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

apache/tvm-ffi#805 · Opened Sep 20, 2026
[Bug] Eagle 参数导出使用硬编码 Open

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

alibaba/MNN#4895 · Opened Sep 20, 2026
Windows managed DNS writes malformed REG_MULTI_SZ and produces phantom NRPT namespaces Open

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

zerotier/ZeroTierOne#2619 · Opened Sep 19, 2026
C++23 build broken again: pluginsengine.cpp uses get_unexpected() (regression of #23193) Open

Difficulty 1/5 Under an hour Newbie friendliness 92/100

qbittorrent/qBittorrent#24938 · Opened Sep 19, 2026
aur-build red on main since #2106: the AUR package has a hand-maintained submodule list and does not know about iec-60908b or cueparser Open

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

grumpycoders/pcsx-redux#2111 · Opened Sep 19, 2026
JIT: vpshufbitqmb is missing INS_FLAGS_IsDstDstSrcAVXInstruction Open

area-CodeGen-coreclr untriaged

Difficulty 1/5 Under an hour Newbie friendliness 92/100

dotnet/runtime#134286 · 1 comment · Opened Sep 19, 2026
/v1/responses: reasoning item with "summary": null rejected as "Cannot determine type of 'item'" Open

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

ggml-org/llama.cpp#29159 · 1 comment · Opened Sep 19, 2026
Add PageRank benchmark to the Graaf perf executable Open

good first issue performance

Difficulty 2/5 1-3 hours Newbie friendliness 85/100

bobluppes/graaf#450 · 1 comment · Opened Sep 19, 2026
Cannot save empty Primary DNS in Settings — blocks split-tunnel-only setups that need no DNS routed through the VPN Open

Difficulty 1/5 Under an hour Newbie friendliness 90/100

amnezia-vpn/amnezia-client#3190 · Opened Sep 19, 2026
Please add release 1.6.1 to the Espressif ESP Registry Open

Difficulty 2/5 1-3 hours Newbie friendliness 65/100

espressif/esp-matter#1856 · Opened Sep 19, 2026
as7341: channel readings are byte-swapped (big-endian read of little-endian registers) Open

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

esphome/esphome#19416 · Opened Sep 19, 2026
Source code uri in gem is invalid Open

bug untriaged

Difficulty 2/5 1-3 hours Newbie friendliness 64/100

protocolbuffers/protobuf#29896 · Opened Sep 19, 2026
UVAtlas::createCharts sorts (area, camera) pairs with a mismatched comparator, truncating the area to int Open

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

alicevision/AliceVision#2180 · 1 comment · Opened Sep 19, 2026
[Push AV Stream Transport] MotionZones is required only for Motion, but the data model requires it for AmbientContext too Open

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

project-chip/connectedhomeip#74307 · Opened Sep 19, 2026
[Closure Dimension] The codegen XML still defaults Speed to Auto after the 1.7 spec removed that fallback Open

Difficulty 1/5 Under an hour Newbie friendliness 90/100

project-chip/connectedhomeip#74305 · Opened Sep 19, 2026
Python demo_nodes_py talker.py contains bug in usage of rlcpy.init Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

ros2/demos#808 · Opened Sep 19, 2026
`ATTACH TABLE t ENGINE = E AS other` formatted as `ATTACH TABLE t AS other ENGINE = E` — parser rejects the formatted form (`AS other` must come after storage for `ATTACH`) Open

comp-sql-syntax fuzz

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

ClickHouse/ClickHouse#121027 · 2 comments · Opened Sep 19, 2026
Formatter emits unquoted identifier `not`: `SELECT NOT \`not\`` re-formats to `SELECT NOT not` which does not parse back Open

comp-sql-syntax fuzz

Difficulty 2/5 1-3 hours Newbie friendliness 85/100

ClickHouse/ClickHouse#121025 · 2 comments · Opened Sep 19, 2026
`clickhouse local` accepts `--logger.level` but always logs at `trace` to the console — user-supplied level is overwritten with `trace` Open

comp-local fuzz

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

ClickHouse/ClickHouse#121022 · 2 comments · Opened Sep 19, 2026
`formatQueryFromJSON`: `ALTER TABLE ... MODIFY CONSTRAINT` without `constraint_decl` — null-pointer dereference in `ASTAlterCommand::formatImpl` Open

comp-sql-syntax fuzz

Difficulty 2/5 1-3 hours Newbie friendliness 86/100

ClickHouse/ClickHouse#121021 · 1 comment · Opened Sep 19, 2026
Waveshare ESP32-C5-Zero RGB Led colour order is incorrect Open

IDE: Arduino IDE Status: Awaiting triage

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

espressif/arduino-esp32#12918 · Opened Sep 19, 2026
picotool load file.bin -o 0x11000000 always fails with second flash chip present and configured Open

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

raspberrypi/picotool#360 · Opened Sep 19, 2026
[Doc]: Feedback for `/zh-cn/latest/developer_guide/evaluation/using_ais_bench.html` Open

documentation

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

vllm-project/vllm-ascend#16935 · Opened Sep 19, 2026
scripts/linux_build.sh fails for Arch: target not found: gcc14 Open

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

LizardByte/Sunshine#5758 · 1 comment · Opened Sep 19, 2026
AutoDiffReduceWindowRev caches operand 0 unconditionally, but the add branch never pops it Open

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

EnzymeAD/Enzyme-JAX#3215 · Opened Sep 19, 2026
Build fails without HarfBuzz even when ENABLE_HARFBUZZ=OFF Open

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

fontforge/fontforge#5900 · Opened Sep 19, 2026
[6.1.10] undeclared identifier 'sw_usleep' Open

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

swoole/swoole-src#6243 · 1 comment · Opened Sep 19, 2026

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C++ Good First Issues

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