CVE-2026-111171
MEDIUM
CVSS 5.4
Published: 2026-10-15
Modified: 2026-10-16
Tenable Plugin
Checking the public Tenable catalog…
Threat Intelligence Pending
IOCs, MITRE ATT&CK techniques, and attack chain data are being generated. Refresh in a few seconds.
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.
Quick Facts
| CVE ID | CVE-2026-111171 |
| CVSS Score | 5.4 |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N |
| Published | 2026-10-15 |
| Exploited | No |
| CISA KEV | No |
| PoC | Not public |
References
- https://github.com/ethereum/web3.py
- https://github.com/ethereum/web3.py/blob/c8c1ed0c9e77e1a8b74…
- https://github.com/ethereum/web3.py/pull/3875
- https://github.com/ethereum/web3.py/security/advisories/GHSA…
- https://www.vulncheck.com/advisories/web3-py-7.15.0-through-…
- https://github.com/ApeWorX/web3.py/security/advisories/GHSA-…