CVE-2026-111171
Web3.py 7.15.0 through 7.16.0 and 8.0.0b2 through 8.0.0 CCIP-Read SSRF Bypass
CVSS Score
5.4
EPSS Score
0.0%
EPSS Percentile
0th
Web3.py 7.15.0 through 7.16.0 and 8.0.0b2 through 8.0.0 contains a server-side request forgery vulnerability because _check_ip_blocked() does not unwrap IPv4-mapped IPv6 addresses in CCIP Read URL validation. Malicious contracts can return OffchainLookup URLs with IPv4-mapped IPv6 hosts or AAAA records, making clients with CCIP Read enabled send requests to loopback, private, or link-local services.
| CWE | CWE-918 |
| Vendor | ethereum |
| Product | web3.py |
| Published | Oct 15, 2026 |
| Last Updated | Oct 15, 2026 |
Stay Ahead of the Next One
Get instant alerts for ethereum web3.py
Be the first to know when new medium vulnerabilities affecting ethereum web3.py are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
ethereum / web3.py
7.15.0 ≤ 7.16.0 8.0.0b2 ≤ 8.0.0
References
github.com: https://github.com/ethereum/web3.py/pull/3875 github.com: https://github.com/ethereum/web3.py/blob/c8c1ed0c9e77e1a8b74902e6a6825e0b00534b10/web3/utils/ccip_url_validation.py#L16-L57 github.com: https://github.com/ethereum/web3.py/security/advisories/GHSA-5hr4-253g-cpx2 github.com: https://github.com/ethereum/web3.py vulncheck.com: https://www.vulncheck.com/advisories/web3-py-7.15.0-through-7.16.0-and-8.0-0b2-through-8.0.0-ccip-read-ssrf-bypass github.com: https://github.com/ApeWorX/web3.py/security/advisories/GHSA-5hr4-253g-cpx2
Credits
SashaMIT Zachariah Mithani