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

Quick assessment

Affected
ethereum web3.py
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

web3.py是ethereum开源的一个用于与以太坊区块链交互的Python库。 web3.py 6.0.0b3至7.15.0之前版本和8.0.0b2之前版本存在代码问题漏洞，该漏洞源于使用智能合约提供的URL时缺少目标验证，可能导致服务器端请求伪造。

AI Predicted 7.5 Difficulty: Easy EPSS 0.23% · P13

Possible ATT&CK Techniques 1 AI

T1187 · Forced Authentication
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I. Basic Information for CVE-2026-40072

Vulnerability Information
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Vulnerability Title
web3.py affected by SSRF via CCIP Read (EIP-3668) OffchainLookup URL handling
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
web3.py 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
web3.py是ethereum开源的一个用于与以太坊区块链交互的Python库。 web3.py 6.0.0b3至7.15.0之前版本和8.0.0b2之前版本存在代码问题漏洞，该漏洞源于使用智能合约提供的URL时缺少目标验证，可能导致服务器端请求伪造。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ethereum web3.py >= 6.0.0b3, < 7.15.0 -

II. Public POCs for CVE-2026-40072

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III. Intelligence Information for CVE-2026-40072

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Vendor Advisories for CVE-2026-40072 (1)

IV. Related Vulnerabilities

Same vendor: ethereum
Same weakness: CWE-918

V. Comments for CVE-2026-40072

Anonymous User
2026-05-17 08:00:41

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