CVE-2026-111171 | Mend Vulnerability Database

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Vulnerability DatabaseCVE-2026-111171

CVE-2026-111171

Published:October 15, 2026

Updated:October 20, 2026

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.

Related Resources (13)

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111171.json

https://github.com/ethereum/web3.py/commit/b1c57bb0a124359c9902daaefab4d8af7c3c4c1e

https://nvd.nist.gov/vuln/detail/CVE-2026-40072

https://pypi.org/project/web3

https://github.com/ethereum/web3.py/blob/c8c1ed0c9e77e1a8b74902e6a6825e0b00534b10/web3/utils/ccip_url_validation.py#L16-L57

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

https://github.com/advisories/GHSA-5hr4-253g-cpx2

https://pypi.org

https://nvd.nist.gov/vuln/detail/CVE-2026-111171

https://github.com/ApeWorX/web3.py/security/advisories/GHSA-5hr4-253g-cpx2

https://github.com/ethereum/web3.py/security/advisories/GHSA-5hr4-253g-cpx2