CVE-2023-30543
MEDIUMCVE-2023-30543 is a medium-severity (CVSS 5.2) CWE-362 vulnerability in @web3-react/coinbase-wallet. O3 Security confirms whether CVE-2023-30543 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
`chainId` may be outdated if user changes chains as part of connection in @web3-react
Blast Radius
@web3-react/coinbase-wallet📦@web3-react/eip1193📦@web3-react/metamask📦@web3-react/walletconnectReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects npm packages — download data is not available via public APIs for these ecosystems.
Description
@web3-react is a framework for building Ethereum Apps . In affected versions the chainId may be outdated if the user changes chains as part of the connection flow. This means that the value of chainId returned by useWeb3React() may be incorrect. In an application, this means that any data derived from chainId could be incorrect. For example, if a swapping application derives a wrapped token contract address from the chainId and a user has changed chains as part of their connection flow the application could cause the user to send funds to the incorrect address when wrapping. This issue has been addressed in PR #749 and is available in updated npm artifacts. There are no known workarounds for this issue. Users are advised to upgrade.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | @web3-react/coinbase-wallet | ≥ 6.0.0&&< 8.0.35-beta.0 | 8.0.35-beta.0 |
| 📦npm | @web3-react/eip1193 | ≥ 6.0.0&&< 8.0.27-beta | 8.0.27-beta |
| 📦npm | @web3-react/metamask | ≥ 6.0.0&&< 8.0.30-beta.0 | 8.0.30-beta.0 |
| 📦npm | @web3-react/walletconnect | ≥ 6.0.0&&< 8.0.37-beta.0 | 8.0.37-beta.0 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @web3-react/coinbase-wallet. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update @web3-react/coinbase-wallet to 8.0.35-beta.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-30543 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether CVE-2023-30543 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to CVE-2023-30543. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is CVE-2023-30543 in your dependencies?
O3 detects CVE-2023-30543 across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.