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Vulnerability Details :

CVE-2026-40072

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-09 Apr, 2026 | 17:41
Updated At-09 Apr, 2026 | 19:37
Rejected At-
Credits

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

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.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
â–¼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:09 Apr, 2026 | 17:41
Updated At:09 Apr, 2026 | 19:37
Rejected At:
â–¼CVE Numbering Authority (CNA)
web3.py affected by SSRF via CCIP Read (EIP-3668) OffchainLookup URL handling

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.

Affected Products
Vendor
ethereum
Product
web3.py
Versions
Affected
  • >= 6.0.0b3, < 7.15.0
  • >= 8.0.0b1, < 8.0.0b2
Problem Types
TypeCWE IDDescription
CWECWE-918CWE-918: Server-Side Request Forgery (SSRF)
Type: CWE
CWE ID: CWE-918
Description: CWE-918: Server-Side Request Forgery (SSRF)
Metrics
VersionBase scoreBase severityVector
4.01.7LOW
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
Version: 4.0
Base score: 1.7
Base severity: LOW
Vector:
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
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/ethereum/web3.py/security/advisories/GHSA-5hr4-253g-cpx2
x_refsource_CONFIRM
https://github.com/ethereum/web3.py/commit/b1c57bb0a124359c9902daaefab4d8af7c3c4c1e
x_refsource_MISC
Hyperlink: https://github.com/ethereum/web3.py/security/advisories/GHSA-5hr4-253g-cpx2
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/ethereum/web3.py/commit/b1c57bb0a124359c9902daaefab4d8af7c3c4c1e
Resource:
x_refsource_MISC
â–¼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
â–¼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:09 Apr, 2026 | 18:17
Updated At:02 Jun, 2026 | 16:48

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.01.7LOW
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary3.17.2HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Type: Secondary
Version: 4.0
Base score: 1.7
Base severity: LOW
Vector:
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Type: Primary
Version: 3.1
Base score: 7.2
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
CPE Matches
apeworx
apeworx
>>web3.py>>Versions from 6.1.0(inclusive) to 7.15.0(exclusive)
cpe:2.3:a:apeworx:web3.py:*:*:*:*:*:python:*:*
apeworx
apeworx
>>web3.py>>6.0.0
cpe:2.3:a:apeworx:web3.py:6.0.0:-:*:*:*:python:*:*
apeworx
apeworx
>>web3.py>>6.0.0
cpe:2.3:a:apeworx:web3.py:6.0.0:beta10:*:*:*:python:*:*
apeworx
apeworx
>>web3.py>>6.0.0
cpe:2.3:a:apeworx:web3.py:6.0.0:beta11:*:*:*:python:*:*
apeworx
apeworx
>>web3.py>>6.0.0
cpe:2.3:a:apeworx:web3.py:6.0.0:beta3:*:*:*:python:*:*
apeworx
apeworx
>>web3.py>>6.0.0
cpe:2.3:a:apeworx:web3.py:6.0.0:beta4:*:*:*:python:*:*
apeworx
apeworx
>>web3.py>>6.0.0
cpe:2.3:a:apeworx:web3.py:6.0.0:beta5:*:*:*:python:*:*
apeworx
apeworx
>>web3.py>>6.0.0
cpe:2.3:a:apeworx:web3.py:6.0.0:beta6:*:*:*:python:*:*
apeworx
apeworx
>>web3.py>>6.0.0
cpe:2.3:a:apeworx:web3.py:6.0.0:beta7:*:*:*:python:*:*
apeworx
apeworx
>>web3.py>>6.0.0
cpe:2.3:a:apeworx:web3.py:6.0.0:beta8:*:*:*:python:*:*
apeworx
apeworx
>>web3.py>>6.0.0
cpe:2.3:a:apeworx:web3.py:6.0.0:beta9:*:*:*:python:*:*
apeworx
apeworx
>>web3.py>>8.0.0
cpe:2.3:a:apeworx:web3.py:8.0.0:beta1:*:*:*:python:*:*
Weaknesses
CWE IDTypeSource
CWE-918Primarysecurity-advisories@github.com
CWE ID: CWE-918
Type: Primary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/ethereum/web3.py/commit/b1c57bb0a124359c9902daaefab4d8af7c3c4c1esecurity-advisories@github.com
Patch
https://github.com/ethereum/web3.py/security/advisories/GHSA-5hr4-253g-cpx2security-advisories@github.com
Exploit
Mitigation
Vendor Advisory
Hyperlink: https://github.com/ethereum/web3.py/commit/b1c57bb0a124359c9902daaefab4d8af7c3c4c1e
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/ethereum/web3.py/security/advisories/GHSA-5hr4-253g-cpx2
Source: security-advisories@github.com
Resource:
Exploit
Mitigation
Vendor Advisory

Change History

0
Information is not available yet

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