{"id":"CVE-2026-111171","title":"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","summary":"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 retu…","severity":"medium","cvss":5.4,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N","cwe":["CWE-918"],"vendor":"ethereum","product":"web3.py","affected":["web3.py >= 7.15.0 <= 7.16.0","web3.py >= 8.0.0b2 <= 8.0.0"],"published":"2026-10-15","updated":"2026-10-15","sourceUpdated":"2026-10-15T19:17:33.300","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-111171","references":[{"url":"https://github.com/ethereum/web3.py","label":"disclosure@vulncheck.com"},{"url":"https://github.com/ethereum/web3.py/blob/c8c1ed0c9e77e1a8b74902e6a6825e0b00534b10/web3/utils/ccip_url_validation.py#L16-L57","label":"disclosure@vulncheck.com"},{"url":"https://github.com/ethereum/web3.py/pull/3875","label":"disclosure@vulncheck.com"},{"url":"https://github.com/ethereum/web3.py/security/advisories/GHSA-5hr4-253g-cpx2","label":"disclosure@vulncheck.com"},{"url":"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","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org","exploit-available"],"ingestedAt":"2026-10-15T19:25:46.425Z","exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-15T19:29:17.459655Z"},"slug":"CVE-2026-111171","body":"## Overview\n\nWeb3.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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":29.7,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":222737,"id":"CVE-2026-111171","ts":1792097073500,"field":"exploit_available","old":"false","new":"true"}]}