Medium 5.4Published Oct 15, 2026

CVE-2026-111171Web3.py 7.15.0 through 7.16.0 and 8.0.0b2 through 8.0.0 CCIP-Read SSRF Bypass

Updated under an hour ago (2026-10-19 07:00 UTC)

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Every CVE for ethereum web3.py

Exploited in the last 30 days

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: 5.4 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
Weakness (CWE): CWE-918
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 15, 2026

Affected products

Affected products

ethereum web3.py ethereum:web3.py (from the name)	from 7.15.0 through 7.16.0; from 8.0.0b2 through 8.0.0	CNA record

References

https://github.com/ethereum/web3.py/pull/3875issue-tracking, technical-description, patch
https://github.com/ethereum/web3.py/blob/c8c1ed0c9e77e1a8b74902e6a6825e0b00534b10/web3/utils/ccip_url_validation.py#L16-L57technical-description
https://github.com/ethereum/web3.py/security/advisories/GHSA-5hr4-253g-cpx2related, vendor-advisory
https://github.com/ethereum/web3.pyproduct
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-bypassthird-party-advisory
https://github.com/ApeWorX/web3.py/security/advisories/GHSA-5hr4-253g-cpx2

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.