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.

1,717 matching issues

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c
Open
Investigate slow tests
Testinggood first issue

cython/cython #7,542 opened Feb 25, 2026 · Python · 8,663 stars

Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
7 comments0 reactions0 assignees
Open
Sub-second cache
enhancementgood first issuein-analysisinvalidneeds-analysisrefined

nginx/nginx #1,156 opened Feb 24, 2026 · C · 30,331 stars

Why recommendedHas a beginner-friendly label · Contributing guide available
Has a beginner-friendly labelContributing guide available
2 comments0 reactions1 assignee
Open
扩容新节点的vnodes数量为0
help wantedquestion

taosdata/TDengine #34,512 opened Feb 5, 2026 · C · 24,849 stars

Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
1 comment0 reactions0 assignees
Open
Define C-variadic FFI functions on `nightly` feature
FFIGood First Issue

PyO3/pyo3 #5,777 opened Feb 4, 2026 · Rust · 10,152 stars

Why recommendedNo assignee yet · No comments yet
No assignee yetNo comments yetHas a beginner-friendly labelContributing guide available
0 comments0 reactions0 assignees
Open
Critical thread initialization lost for NonStop builds
branch: 3.3branch: 3.4branch: 3.5branch: 3.6branch: masterhelp wantedtriaged: bug

openssl/openssl #29,854 opened Jan 29, 2026 · C · 30,157 stars

Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
15 comments0 reactions0 assignees
Open
Optimize base64 decoding when AVX is available
branch: masterhelp wantedtriaged: feature

openssl/openssl #29,739 opened Jan 23, 2026 · C · 30,157 stars

Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
2 comments4 reactions0 assignees
Open
windows server 2019 issue
help wanted

memcached/memcached #1,261 opened Jan 19, 2026 · C · 14,185 stars

Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
6 comments0 reactions0 assignees
Open
[NEW] Cross cluster replication support
enhancementhelp wanted

valkey-io/valkey #3,066 opened Jan 15, 2026 · C · 25,779 stars

Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
10 comments7 reactions0 assignees
Open
[YSQL] Output the result of COMMIT or ROLLBACK
area/ysqlgood first issuekind/bugpriority/mediumstatus/awaiting-triage

yugabyte/yugabyte-db #29,929 opened Jan 10, 2026 · C · 8,229 stars

Why recommendedNo assignee yet · No comments yet
No assignee yetNo comments yetHas a beginner-friendly label
0 comments0 reactions0 assignees
Open
分页查询超级表特别慢
help wantedquestion

taosdata/TDengine #34,193 opened Jan 7, 2026 · C · 24,849 stars

Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
4 comments0 reactions0 assignees
Open
AIX 7.2 test_lhash unit test failure on OpenSSL 3.5.4
branch: 3.5branch: 3.6branch: masterhelp wantedtriaged: bug

openssl/openssl #29,562 opened Jan 6, 2026 · C · 30,157 stars

Why recommendedNo assignee yet · Has a beginner-friendly label
No assignee yetHas a beginner-friendly labelContributing guide available
15 comments0 reactions0 assignees