CVE-2026-40072: web3.py allows you to interact with the Ethereum blockchain using Python

Q: How do I fix CVE-2026-40072?

web3.py: upgrade to 7.15.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-40072 being exploited?

CVE-2026-40072 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-40072 affect?

CVE-2026-40072 affects web3.py. Severity is high (CVSS 7.2). 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

Q: How urgent is CVE-2026-40072?

Priority 39/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.2REMOTEUPGRADE

CVE-2026-40072 is a high-severity flaw (CVSS 7.2) affecting web3.py. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 defaul

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 86%)
CISA exploited list	No
Weakness	CWE-918
Published	2026-04-09
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: apeworx

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-09 18:17 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

apeworx web3.py UPGRADE

Affected: >= 6.1.0 and < 7.15.0 · 6.0.0 · 6.0.0 beta10 · 6.0.0 beta11 · 6.0.0 beta3 · 6.0.0 beta4 · 6.0.0 beta5 · 6.0.0 beta6

Fixed in: 7.15.0

Safe to downgrade to: a release before 6.0.0

1. Check installed version

pip show web3.py

2. UPGRADE to 7.15.0

pip install --upgrade "web3.py>=7.15.0"

3. If no update is available yet, DOWNGRADE to a release before 6.0.0

pip index versions web3.py pip install "web3.py<6.0.0"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-40072?

web3.py: upgrade to 7.15.0. Exact commands for each OS are on this page.

Is CVE-2026-40072 being exploited?

CVE-2026-40072 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-40072 affect?

CVE-2026-40072 affects web3.py. Severity is high (CVSS 7.2). 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

How urgent is CVE-2026-40072?

Priority 39/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Python vulnerabilities

References

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