NethermindEth/nethermind

A robust, high-performance execution client for Ethereum node operators.

Stars: 1.6k
Forks: 733
Open beginner issues: 0
Indexed issues: 199
Avg merge: 1d 17h
Merged PRs (30d): 476

Dominant language: C#
License: GPL-3.0
Last GitHub push: Sep 20, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: good first issue help wanted

Beginner friendly Everything

Open All

199 open issues indexed

FlatDb: RocksDB auto-repair of a corrupted flat DB silently drops leaves; node resumes as "already have state" and diverges from consensus Open

bug database rocksdb

Difficulty 5/5 Over a week Newbie friendliness 28/100

NethermindEth/nethermind#13577 · Opened Sep 18, 2026
Legacy state sync (StateNodes/TreeSync) on the path-keyed Flat backend leaves stale storage subtrees across pivot changes → wrong state, deterministic HeaderGasUsedMismatch after sync Open

bug database sync

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

NethermindEth/nethermind#13576 · Opened Sep 18, 2026
FlatDb + legacy state sync (Sync.SnapSync=false): restart during state sync leaves permanent account/storage holes (trie complete, flat leaf missing) → deterministic HeaderGasUsedMismatch after sync Open

bug database sync

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

NethermindEth/nethermind#13575 · Opened Sep 18, 2026
Block access list retention should follow the history expiry window Open

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

NethermindEth/nethermind#13553 · Opened Sep 17, 2026
P2PProtocolHandler processes a second Hello on an already-initialized session instead of rejecting it, growing the agreed-capabilities list without bound for a static or trusted peer Open

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

NethermindEth/nethermind#13515 · Opened Sep 15, 2026
NonceManager's AddressNonceManager entries are never released for eth_sendRawTransaction senders, and are allocated for every submitted address even when the transaction is rejected Open

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

NethermindEth/nethermind#13507 · Opened Sep 15, 2026
FlatDb: --FlatDb.Enabled=false on an existing flat DB silently discards state and full-resyncs (detection asymmetry vs patricia) Open

Difficulty 3/5 1-2 days Newbie friendliness 67/100

NethermindEth/nethermind#13428 · Opened Sep 13, 2026
blockHash mismatch in newPayload marks an already accepted block as invalid Open

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

NethermindEth/nethermind#13370 · 1 reaction · Opened Sep 10, 2026
Flat is 17-20% slower per block than HalfPath on chiado and 2.3x slower at p99, the only pairing where Flat loses Open

stability

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

NethermindEth/nethermind#13205 · 1 comment · Opened Sep 6, 2026
JSON-RPC and the Engine API stay closed for the whole StartupBlockTreeFixer replay after a restart, unbounded and unannounced Open

stability

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

NethermindEth/nethermind#13203 · 1 comment · Opened Sep 6, 2026
JsonRpcResponseWriter.WriteStreamableAsync skips the envelope tail when the result throws, returning an unterminated body with no id Open

stability

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

NethermindEth/nethermind#13201 · 1 comment · Opened Sep 6, 2026
trace_block returns a truncated 28-byte 200 response when the state subtree is pruned under a live root (MissingTrieNodeException escapes the streaming writer; distinct from #13130, not fixed by #13095) Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

NethermindEth/nethermind#13153 · Opened Sep 4, 2026
Json RPC Streaming - decide if should be completely removed Open

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

NethermindEth/nethermind#13114 · Opened Sep 3, 2026
Feat: Less aggressive log index backfill Open

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

NethermindEth/nethermind#13092 · Opened Sep 2, 2026
Implement EIP-8304: Trustless Log and Transaction Index Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

NethermindEth/nethermind#13071 · Opened Sep 1, 2026
A debug_trace* custom JS tracer can abort the whole client (hardcoded 128 MiB V8 old-space constraint) Open

Difficulty 5/5 Over a week Newbie friendliness 45/100

NethermindEth/nethermind#13054 · Opened Aug 31, 2026
Discovery Open

NethermindEth/nethermind#12919 · 1 assignee · Opened Aug 20, 2026
ProofRpcModule's transaction-hash lookup miss (receiptFinder.FindBlockHash null) fails with a ResourceNotFound error, while the documented referent eth methods return a successful null for the same miss Open

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

NethermindEth/nethermind#12846 · Opened Aug 16, 2026
request-parameter parsers accept a broader input schema than the documentation states Open

Difficulty 4/5 3-5 days Newbie friendliness 62/100

NethermindEth/nethermind#12842 · Opened Aug 16, 2026
response payload shape switches on a request flag or subscription option that the documentation does not account for Open

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

NethermindEth/nethermind#12841 · Opened Aug 16, 2026
`action` field nesting and placement diverges from the documented `ParityTraceAction` shape Open

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

NethermindEth/nethermind#12840 · Opened Aug 16, 2026
custom JsonConverters emit a wire shape that diverges from the documented CLR model Open

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

NethermindEth/nethermind#12839 · Opened Aug 16, 2026
pending, unmined, or partial-context object members serialize as `null` although the documentation types them as non-null Open

Difficulty 5/5 Over a week Newbie friendliness 28/100

NethermindEth/nethermind#12835 · Opened Aug 16, 2026
Generated JSON-RPC documentation leaks internal CLR type members and wrong generic-specialization paths Open

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

NethermindEth/nethermind#12828 · 1 comment · Opened Aug 15, 2026
FlatDb: persisted snapshot serves pre-range state during catch-up, causing a valid block to be rejected and 989 canonical blocks deleted Open

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

NethermindEth/nethermind#12764 · 3 comments · Opened Aug 10, 2026
eth_syncing returns false during entire forward sync once head tracks bestSuggested Open

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

NethermindEth/nethermind#12673 · Opened Aug 3, 2026
FilterManager filter result queues are unbounded in size (time-based TTL does not bound memory) Open

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

NethermindEth/nethermind#12490 · 1 comment · Opened Jul 19, 2026
Frame Transactions family (EIP-8141 / 8250 / 8272) — tracking Open

NethermindEth/nethermind#12456 · 1 assignee · Opened Jul 15, 2026
EIP-8272: Recent Roots for Frame Transactions Open

NethermindEth/nethermind#12455 · 1 assignee · Opened Jul 15, 2026
EIP-8250: Keyed Nonces for Frame Transactions Open

NethermindEth/nethermind#12454 · 1 assignee · Opened Jul 15, 2026
EIP-8141: Frame Transactions Open

NethermindEth/nethermind#12453 · 1 assignee · Opened Jul 15, 2026
Dual-stack (IPv4 + IPv6) networking support Open

NethermindEth/nethermind#12309 · 2 reactions · 1 assignee · Opened Jul 6, 2026
FlatDb computes a wrong state root and rejects a canonical block (consensus divergence) — chiado, intermittent Open

NethermindEth/nethermind#11993 · 4 comments · 1 assignee · Opened Jun 15, 2026
Support local block explorers like esplr Open

archive rpc

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

NethermindEth/nethermind#11990 · 10 comments · Opened Jun 14, 2026
`eth_sendRawTransaction`: RLP decode failure returns wrong JSON-RPC error code Open

rpc

NethermindEth/nethermind#11921 · 1 assignee · Opened Jun 6, 2026
Refactor to unify IFinalizationManager & ReorgDepthFinalizedStateProvider Open

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

NethermindEth/nethermind#11421 · Opened Apr 29, 2026
RPC - Spec & Hive Tests Discrepancies Open

rpc

NethermindEth/nethermind#11412 · 11 comments · 1 assignee · Opened Apr 29, 2026
Trie exceptions from Block 1 on op-mainnet archive sync on master Open

stability

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

NethermindEth/nethermind#11194 · Opened Apr 16, 2026
Hive: Remove testing_blockBuildingV1 from known hive failures Open

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

NethermindEth/nethermind#11156 · Opened Apr 15, 2026
Assertoor: validator-exit-test has never passed on master Open

stability

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

NethermindEth/nethermind#10964 · Opened Mar 26, 2026
Logging the time of the block Open

NethermindEth/nethermind#10890 · 2 comments · 1 reaction · 2 assignees · Opened Mar 19, 2026
Enforce coding style rules via static analysis in CI Open

devops

NethermindEth/nethermind#10830 · 1 comment · 1 assignee · Opened Mar 14, 2026
Resolve the instruction size issue in Zisk Open

zkevm

NethermindEth/nethermind#10631 · 1 comment · 1 assignee · Opened Feb 24, 2026
High Networking traffic after Nethermind upgrade to 1.36.0 Open

NethermindEth/nethermind#10515 · 1 comment · 1 assignee · Opened Feb 13, 2026
System.InvalidOperationException: Maximum size of branch reached (8192). This is unexpected. Open

stability

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

NethermindEth/nethermind#10494 · 2 comments · Opened Feb 12, 2026
Nethermind memory leak with docker at 1.36.0 Open

stability

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

NethermindEth/nethermind#10458 · 4 comments · 1 reaction · Opened Feb 8, 2026
Nethermind 1.36.0 crashes immediately with exit code 132 (SIGILL - Illegal Instruction) on Intel Celeron N5105 CPU (Jasper Lake / Tremont architecture). Open

[Pri] High bug

NethermindEth/nethermind#10339 · 9 comments · 2 assignees · Opened Jan 27, 2026
Podman container leads to core dumping since version 1.36.0 Open

stability

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

NethermindEth/nethermind#10284 · Opened Jan 21, 2026
Ocasional missing `Parent beacon block root` missing Open

can't reproduce optimism

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

NethermindEth/nethermind#9921 · 4 comments · Opened Dec 11, 2025
Failed to initialize validators list on block 43572715 (0xa47f8734f602fa1370fda16917dac92514d5e01b6333ac0030283a1610691146) Open

stability

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

NethermindEth/nethermind#9913 · Opened Dec 10, 2025

A short digest of beginner-friendly GitHub issues.