Low 1.7Published Apr 9, 2026

CVE-2026-40072web3.py affected by SSRF via CCIP Read (EIP-3668) OffchainLookup URL handling

Updated under an hour ago (Oct 26, 2026, 8:00 PM ET)

Does this affect you?

It affects ethereum web3.py and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for ethereum web3.py

Exploited in the last 30 days

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.

CVSS: 1.7 LOW (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U
Weakness (CWE): CWE-918
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Apr 9, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

ethereum web3.py ethereum:web3.py (from the name)	from 6.0.0b3, < 7.15.0; from 8.0.0b1, < 8.0.0b2	CNA record
apeworx web3.py apeworx:web3.py	from 6.1.0 before 7.15.0; 6.0.0; 6.0.0; 6.0.0; 6.0.0; 6.0.0; 6.0.0; 6.0.0; and 4 more ranges	NVD

References

References

https://github.com/ethereum/web3.py/security/advisories/GHSA-5hr4-253g-cpx2	x-refsource-confirm, exploit, mitigation, vendor-advisory
https://github.com/ethereum/web3.py/commit/b1c57bb0a124359c9902daaefab4d8af7c3c4c1e	x-refsource-misc, patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.