CVE-2026-111171
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 4.0
- 6.3
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 - CVSS 3.1
- 5.4
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N - EPSS
- 0.3% chance of exploitation in the next 30 days; higher than 27% of CVEs (scores of 2026-10-25)
- CWE
- CWE-918
- Published
- Modified
- Record from
- the NVD, synced
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-5hr4-253g-cpx2 | PyPI | web3 | >=6.0.0b3 <7.15.0 | 7.15.0 |
| GHSA-5hr4-253g-cpx2 | PyPI | web3 | >=8.0.0b1 <8.0.0b2 | 8.0.0b2 |
| PYSEC-2026-3414 | PyPI | web3 | >=6.0.0b3 <7.15.0 >=8.0.0b1 <8.0.0b2 | 7.15.0, 8.0.0b2 |
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