CVE-2026-40072Public exploitNetwork attack vector

SSRF via unvalidated OffchainLookup destination URLs

Published Apr 9, 2026 · Updated Apr 9, 2026

SSRF in web3.py 6.0.0b3 through 7.14.1 and 8.0.0b1 allows remote attackers to make backend services request arbitrary URLs. The synchronous and asynchronous OffchainLookup handlers substitute sender and data into contract-supplied URLs, then issue GET or POST requests without scheme, host, address-range, or redirect validation. Default-enabled CCIP Read reaches this path when an application calls an untrusted contract, enabling blind access to internal services and cloud metadata endpoints from the process network context.

CVSS severity7.2
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in web3.py 6.0.0b3 through 7.14.1 and 8.0.0b1 allows remote attackers to make backend services request arbitrary URLs. The synchronous and asynchronous OffchainLookup handlers substitute sender and data into contract-supplied URLs, then issue GET or POST requests without scheme, host, address-range, or redirect validation. Default-enabled CCIP Read reaches this path when an application calls an untrusted contract, enabling blind access to internal services and cloud metadata endpoints from the process network context.

The record

CVE
CVE-2026-40072
Published
Apr 9, 2026
Updated
Apr 9, 2026
Vendor
Ethereum Foundation
Product
web3.py
Classifications
CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 6.0.0b3, < 7.15.0
  2. Affected versionversion=>= 8.0.0b1, < 8.0.0b2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ethereum Foundation · web3.pyversion=>= 6.0.0b3, < 7.15.0; version=>= 8.0.0b1, < 8.0.0b2

Published CVSS scores

1.7GitHub, Inc.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
7.2NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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