CVE-2026-40072
Description
web3.py allows you to interact with the Ethereum blockchain using Python. From 6.0.0b3 to before 7.15.0 and 8.0.0b2, web3.py implements CCIP Read / OffchainLookup (EIP-3668) by performing HTTP requests to URLs supplied by smart contracts in offchain_lookup_payload["urls"]. The implementation uses these contract-supplied URLs directly (after {sender} / {data} template substitution) without any destination validation. CCIP Read is enabled by default (global_ccip_read_enabled = True on all providers), meaning any application using web3.py's .call() method is exposed without explicit opt-in. This results in Server-Side Request Forgery (SSRF) when web3.py is used in backend services, indexers, APIs, or any environment that performs eth_call / .call() against untrusted or user-supplied contract addresses. A malicious contract can force the web3.py process to issue HTTP requests to arbitrary destinations, including internal network services and cloud metadata endpoints. This vulnerability is fixed in 7.15.0 and 8.0.0b2.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
web3PyPI | >= 6.0.0b3, < 7.15.0 | 7.15.0 |
web3PyPI | >= 8.0.0b1, < 8.0.0b2 | 8.0.0b2 |
Affected products
14cpe:2.3:a:apeworx:web3.py:6.0.0:beta10:*:*:*:python:*:*+ 11 more
- cpe:2.3:a:apeworx:web3.py:6.0.0:beta10:*:*:*:python:*:*
- cpe:2.3:a:apeworx:web3.py:6.0.0:beta11:*:*:*:python:*:*
- cpe:2.3:a:apeworx:web3.py:6.0.0:beta3:*:*:*:python:*:*
- cpe:2.3:a:apeworx:web3.py:6.0.0:beta4:*:*:*:python:*:*
- cpe:2.3:a:apeworx:web3.py:6.0.0:beta5:*:*:*:python:*:*
- cpe:2.3:a:apeworx:web3.py:6.0.0:beta6:*:*:*:python:*:*
- cpe:2.3:a:apeworx:web3.py:6.0.0:beta7:*:*:*:python:*:*
- cpe:2.3:a:apeworx:web3.py:6.0.0:beta8:*:*:*:python:*:*
- cpe:2.3:a:apeworx:web3.py:6.0.0:beta9:*:*:*:python:*:*
- cpe:2.3:a:apeworx:web3.py:6.0.0:-:*:*:*:python:*:*
- cpe:2.3:a:apeworx:web3.py:8.0.0:beta1:*:*:*:python:*:*
- cpe:2.3:a:apeworx:web3.py:*:*:*:*:*:python:*:*range: >=6.1.0,<7.15.0
Patches
Vulnerability mechanics
References
4- github.com/ethereum/web3.py/commit/b1c57bb0a124359c9902daaefab4d8af7c3c4c1envdPatchWEB
- github.com/ethereum/web3.py/security/advisories/GHSA-5hr4-253g-cpx2nvdExploitMitigationVendor AdvisoryWEB
- github.com/advisories/GHSA-5hr4-253g-cpx2ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-40072ghsaADVISORY
News mentions
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