{"cve":"CVE-2026-111171","nvd":{"published":"2026-10-15T19:17:33.300","modified":"2026-10-16T18:25:45.343","status":"Deferred","description":"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.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N","score":6.3},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N","score":5.4},"cwes":["CWE-918"],"references":["https://github.com/ethereum/web3.py","https://github.com/ethereum/web3.py/blob/c8c1ed0c9e77e1a8b74902e6a6825e0b00534b10/web3/utils/ccip_url_validation.py#L16-L57","https://github.com/ethereum/web3.py/pull/3875","https://github.com/ethereum/web3.py/security/advisories/GHSA-5hr4-253g-cpx2","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"],"products":[],"source":"nvd","synced_at":"2026-10-19T23:00:53.604569364+00:00"},"epss":{"cve":"CVE-2026-111171","score":0.00341,"percentile":0.2737,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-5hr4-253g-cpx2","url":"https://osv.dev/vulnerability/GHSA-5hr4-253g-cpx2","summary":"web3.py: SSRF via CCIP Read (EIP-3668) OffchainLookup URL handling","modified":"2026-10-16T10:55:39.246095876Z","packages":[{"ecosystem":"PyPI","name":"web3","purl":"pkg:pypi/web3","ranges":[">=6.0.0b3 <7.15.0"],"fixed":["7.15.0"]},{"ecosystem":"PyPI","name":"web3","purl":"pkg:pypi/web3","ranges":[">=8.0.0b1 <8.0.0b2"],"fixed":["8.0.0b2"]}]},{"id":"PYSEC-2026-3414","url":"https://osv.dev/vulnerability/PYSEC-2026-3414","summary":"web3.py: SSRF via CCIP Read (EIP-3668) OffchainLookup URL handling","modified":"2026-10-16T10:55:39.246095876Z","packages":[{"ecosystem":"PyPI","name":"web3","purl":"pkg:pypi/web3","ranges":[">=6.0.0b3 <7.15.0",">=8.0.0b1 <8.0.0b2"],"fixed":["7.15.0","8.0.0b2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}