OpenZeppelin/openzeppelin-contracts

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OpenZeppelin Contracts is a library for secure smart contract development.

Stars: 27.2k
Forks: 12.4k
Open beginner issues: 0
Indexed issues: 225
Avg merge: 2d 19h
Merged PRs (30d): 33

Dominant language: Solidity
License: MIT
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: good first issue

Beginner friendly Everything

Open All

225 open issues indexed

Revisit `SignatureChecker` ECDSA/ERC-1271 ordering once EIP-8151 + EIP-8298 ship Open

area: cryptography contracts needs milestone on hold

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

OpenZeppelin/openzeppelin-contracts#6773 · Opened Sep 15, 2026
Add `Uint128Heap`, `Uint64Heap` & `Uint32Heap` Open

idea

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

OpenZeppelin/openzeppelin-contracts#6767 · Opened Sep 14, 2026
Crosschain bridges accept address parts that are not 20 bytes and zero-pad them on arrival Open

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

OpenZeppelin/openzeppelin-contracts#6763 · 2 comments · Opened Sep 11, 2026
Review `next-v6.0` changesets Open

OpenZeppelin/openzeppelin-contracts#6741 · 2 assignees · Opened Sep 4, 2026
Circular import between `TransparentUpgradeableProxy` and `ProxyAdmin` Open

Difficulty 3/5 1-2 days Newbie friendliness 66/100

OpenZeppelin/openzeppelin-contracts#6652 · 2 comments · Opened Jul 27, 2026
Tracking: define a policy for reverts during user operation validation Open

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

OpenZeppelin/openzeppelin-contracts#6649 · Opened Jul 27, 2026
Consider adding a `MessageHashUtils.domainBytes` helper for EIP-712 domain field encoding Open

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

OpenZeppelin/openzeppelin-contracts#6620 · 1 comment · Opened Jul 20, 2026
Improve NatSpec readability for inherited method references in generated docs Open

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

OpenZeppelin/openzeppelin-contracts#6595 · 1 comment · Opened Jun 26, 2026
RLP decoders accept trailing bytes after valid data items Open

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

OpenZeppelin/openzeppelin-contracts#6515 · 3 comments · Opened May 11, 2026
Add ERC20 extension with configurable approval caps and expiring allowances Open

idea

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

OpenZeppelin/openzeppelin-contracts#6500 · Opened May 6, 2026
Extending VestingWallet to have revocability Open

Difficulty 5/5 Over a week Newbie friendliness 38/100

OpenZeppelin/openzeppelin-contracts#6493 · Opened May 5, 2026
Update docs workflow for new docs monorepo Open

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

OpenZeppelin/openzeppelin-contracts#6463 · 1 comment · 1 reaction · Opened Apr 6, 2026
Explore epoch-based fulfillment for ERC-7540 (`ERC7540EpochRedeem` / `ERC7540EpochDeposit`) Open

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

OpenZeppelin/openzeppelin-contracts#6447 · Opened Mar 30, 2026
Add `ERC7540ControlledRedeem` / `ERC7540ControlledDeposit`: concrete controlled-fulfillment extensions for ERC-7540 Open

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

OpenZeppelin/openzeppelin-contracts#6446 · Opened Mar 30, 2026
Add `ERC7540DelayedRedeem` / `ERC7540DelayedDeposit`: concrete delayed-fulfillment extensions for ERC-7540 Open

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

OpenZeppelin/openzeppelin-contracts#6445 · Opened Mar 30, 2026
Prevent proposals with duplicate actions from being submitted in `GovernorTimelockCompound` Open

good first issue

OpenZeppelin/openzeppelin-contracts#6431 · 4 comments · 1 assignee · Opened Mar 23, 2026
Add `ERC-6372: Contract Clock interface` to `VestingWallet` Open

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

OpenZeppelin/openzeppelin-contracts#6389 · 1 comment · Opened Mar 3, 2026
Unrecoverable deadlock when upgrading UUPS proxy from v4 (sequential storage) to v5 (ERC-7201 namespaced storage) Open

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

OpenZeppelin/openzeppelin-contracts#6362 · 5 comments · Opened Feb 20, 2026
Add ERC-5564 Open

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

OpenZeppelin/openzeppelin-contracts#6313 · 1 comment · 1 reaction · Opened Jan 26, 2026
Addition of an RSA validation optimization Open

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

OpenZeppelin/openzeppelin-contracts#6299 · 2 comments · 1 reaction · Opened Jan 18, 2026
Notes on governor queuing & delayed proposal Open

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

OpenZeppelin/openzeppelin-contracts#6052 · Opened Nov 4, 2025
feat: add SSTORE2 library Open

idea

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

OpenZeppelin/openzeppelin-contracts#5979 · 3 comments · 1 reaction · Opened Oct 8, 2025
Implement ERC-6366: Permission Token and ERC-6617: Bit Based Permission Open

idea implementation-of-draft-erc

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

OpenZeppelin/openzeppelin-contracts#5935 · 2 comments · Opened Sep 17, 2025
Implement ERC-7710 DelegationManager as an ERC-7579 execution module. Open

OpenZeppelin/openzeppelin-contracts#5884 · 2 comments · 1 assignee · Opened Aug 25, 2025
AccessManagedProxy: ERC1967 proxy with built-in access control using AccessManager Open

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

OpenZeppelin/openzeppelin-contracts#5856 · 7 reactions · Opened Aug 15, 2025
Make TransparentUpgradeableProxy work with existing ProxyAdmins Open

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

OpenZeppelin/openzeppelin-contracts#5855 · 9 comments · 1 reaction · Opened Aug 15, 2025
Add Zip library Open

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

OpenZeppelin/openzeppelin-contracts#5817 · 2 comments · Opened Jul 24, 2025
Add support for ERC-7535: Native Asset ERC-4626 Tokenized Vault Open

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

OpenZeppelin/openzeppelin-contracts#5808 · Opened Jul 21, 2025
`VestingWallet` bricked if aggregate of transfers in exceed `type(uint256).max` Open

bug

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

OpenZeppelin/openzeppelin-contracts#5793 · 5 comments · Opened Jul 10, 2025
Move Paused and Unpaused event definitions to an interface Open

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

OpenZeppelin/openzeppelin-contracts#5791 · 4 comments · Opened Jul 9, 2025
Consider adding gas‑efficient, in‑memory, fixed‑capacity stack (first in, last out) Open

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

OpenZeppelin/openzeppelin-contracts#5781 · 1 comment · Opened Jul 4, 2025
Governor: Add Advanced Counting Extension Open

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

OpenZeppelin/openzeppelin-contracts#5773 · Opened Jun 27, 2025
Consider using Time library in AccessControlDefaultAdminRules Open

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

OpenZeppelin/openzeppelin-contracts#5721 · Opened Jun 7, 2025
Review `uint32` in Time Delays library for sub-second chains Open

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

OpenZeppelin/openzeppelin-contracts#5669 · 4 comments · 1 reaction · Opened May 5, 2025
Consider using `require(bool, Error)` syntax after 0.8.27 Open

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

OpenZeppelin/openzeppelin-contracts#5667 · 1 comment · Opened May 5, 2025
Consider making `_hasSchedulePassed` internal virtual in AccessControlDefaultAdminRules Open

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

OpenZeppelin/openzeppelin-contracts#5666 · 7 comments · Opened May 3, 2025
Account Abstraction Framework Migration Open

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

OpenZeppelin/openzeppelin-contracts#5665 · Opened May 3, 2025
Add a Basic Graph Utility Library (`Graph.sol`) Open

area: datastructures idea

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

OpenZeppelin/openzeppelin-contracts#5650 · 1 comment · Opened Apr 26, 2025
`ERC721Consecutive` batch minting not enabled after construction Open

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

OpenZeppelin/openzeppelin-contracts#5621 · 4 comments · Opened Apr 2, 2025
Expose binary lookup functions in Checkpoint Open

Difficulty 2/5 1-3 hours Newbie friendliness 50/100

OpenZeppelin/openzeppelin-contracts#5608 · 5 comments · Opened Mar 27, 2025
Adding EIP-712-compliant off-chain signature generation script for the new pattern introduced in PR #5574 Open

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

OpenZeppelin/openzeppelin-contracts#5601 · 1 comment · Opened Mar 25, 2025
Improve GovernorStorage Test Coverage and Documentation Open

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

OpenZeppelin/openzeppelin-contracts#5550 · 1 comment · Opened Mar 4, 2025
Post-Quantum Standard Contracts Open

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

OpenZeppelin/openzeppelin-contracts#5549 · Opened Mar 4, 2025
Enhance Test Coverage & Address Token Address Equality in GovernorERC721 Tests Open

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

OpenZeppelin/openzeppelin-contracts#5521 · 2 comments · Opened Feb 24, 2025
Add Array.uniquifySorted to the Arrays library Open

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

OpenZeppelin/openzeppelin-contracts#5520 · Opened Feb 21, 2025
[Breaking changes] For 6.0 Open

breaking change

OpenZeppelin/openzeppelin-contracts#5498 · 11 comments · 2 reactions · 1 assignee · Opened Feb 11, 2025
Feature: add Mock Contract Boilerplate for usage in library Open

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

OpenZeppelin/openzeppelin-contracts#5491 · Opened Feb 6, 2025
ERC-7201 strorage slots for UpgradeableBeacon Open

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

OpenZeppelin/openzeppelin-contracts#5452 · Opened Jan 22, 2025
Simplify Rounding Modes Open

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

OpenZeppelin/openzeppelin-contracts#5411 · 1 comment · Opened Dec 30, 2024
coded `pauseFor(uint time)` functionality for `Pausable.sol` Open

idea

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

OpenZeppelin/openzeppelin-contracts#5378 · 6 comments · Opened Dec 16, 2024

OpenZeppelin/openzeppelin-contracts

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