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 335,698 issues.
6% of 335,698 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

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Website Doc Typo Open

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

nasa/fprime#6007 · Opened Sep 21, 2026
RingOutlierFilterComponent never sets row_step on its output PointCloud2 (always 0) Open

Difficulty 1/5 1-3 hours Newbie friendliness 92/100

autowarefoundation/autoware_universe#13413 · Opened Sep 21, 2026
HTML export opens a span per character for system messages Open

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

Mudlet/Mudlet#10974 · 1 comment · Opened Sep 21, 2026
[Memory Safety] Memory Safety Analysis: artifact download blocked by network egress restrictions (run `#92`) Open

automated-analysis bug memory-safety

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

Z3Prover/z3#10883 · Opened Sep 21, 2026
Blank row in mpc.gencost reads past the start of the string Open

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

ORNL/GridKit#587 · Opened Sep 20, 2026
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
Installed gdcmConfigure.h leaks build-machine paths and an unevaluated generator expression Open

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

InsightSoftwareConsortium/ITK#6876 · Opened Sep 20, 2026
CI: the Windows build script reports success after a failed compile Open

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

Mudlet/Mudlet#10967 · Opened Sep 20, 2026
1.9.0: hard dependency on SSE Engine Fixes (EngineFixes.dll) is undocumented Open

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

community-shaders/skyrim-community-shaders#2724 · 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
Reduce memory usage of StaticMemPool Open

Difficulty 1/5 Under an hour Newbie friendliness 88/100

beyond-all-reason/RecoilEngine#3390 · 1 comment · 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
Clarify DSpark Graph Support Policy for v1 Open

Difficulty 2/5 1-3 hours Newbie friendliness 63/100

vllm-project/vllm-ascend#17018 · 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
Public API in detail namespace - `rclcpp::node_interfaces::detail::NodeInterfacesSupport` Open

enhancement

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

ros2/rclcpp#3281 · 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
[VL] madvise(WILLNEED) call fails in MmapFileStream because of wrong calculation of fetching length Open

bug triage

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

apache/gluten#13062 · 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
TMapViewManager::slot_viewClosed() can never clean up after a destroyed map view Open

mapper bug

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

Mudlet/Mudlet#10956 · 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
[L10n][TR] Accesskey collisions in bookmark and tab context menus Open

component: localization good first issue platform: windows

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

zen-browser/desktop#15488 · 1 reaction · 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
[cuMAC][Release 26-2] TBS bits used as bytes when updating UE buffers Open

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

NVIDIA/aerial-cuda-accelerated-ran#67 · Opened Sep 20, 2026
[Doc]: GLM-5 & GLM-5.1文档latest中A3PD分离配置 --kv-cache-dtype int8 \ --attention_config.indexer_kv_dtype int8 \ 服务启动失败 Open

documentation glm5 llm-model

Difficulty 1/5 Under an hour Newbie friendliness 86/100

vllm-project/vllm-ascend#16954 · Opened Sep 20, 2026
docs: MLT's "ALP" is just a subset of the ALP specification Open

Difficulty 2/5 1-3 hours Newbie friendliness 75/100

maplibre/maplibre-tile-spec#1723 · 7 comments · 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
The detached window's toggle-toolbar action is never added to any menu Open

bug

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

Mudlet/Mudlet#10951 · Opened Sep 20, 2026
A detached window's "Show Toolbar" menu item starts out of step with its toolbar Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 74/100

Mudlet/Mudlet#10950 · Opened Sep 20, 2026
Package Manager shows a blank details pane with no reason when the selected package is missing from the index Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 74/100

Mudlet/Mudlet#10948 · Opened Sep 20, 2026
saveProfile() silently ignores a non-string first argument Open

bug Lua only

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

Mudlet/Mudlet#10944 · Opened Sep 20, 2026
install(DIRECTORY ../3rdparty/lcf) ships the whole submodule with no FILES_MATCHING filter Open

bug

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

Mudlet/Mudlet#10943 · Opened Sep 20, 2026
Compile qt-tags-widget's single source into mudlet_core instead of adding it as a sub-project Open

bug

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

Mudlet/Mudlet#10942 · Opened Sep 20, 2026
Field name changes not documented in Rules26-1-0-to-26-2-0.md Open

Triage UnconfirmedDefect

Difficulty 1/5 Under an hour Newbie friendliness 88/100

NatLabRockies/EnergyPlus#11805 · Opened Sep 20, 2026
"Replace blank lines with a space" turns the telnet posting-timer flush into a spurious one-space line Open

bug

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

Mudlet/Mudlet#10934 · Opened Sep 19, 2026

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C++ Good First Issues

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