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 v3 5.4 MEDIUM

5.4^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.2 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
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
https://github.com/ApeWorX/web3.py/security/advisories/GHSA-5hr4-253g-cpx2

Configurations

No configuration.

History

15 Oct 2026, 20:17

Type	Values Removed	Values Added
References		() https://github.com/ApeWorX/web3.py/security/advisories/GHSA-5hr4-253g-cpx2 -

15 Oct 2026, 19:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-15 19:17

Updated : 2026-10-16 18:25

NVD link : CVE-2026-111171

Mitre link : CVE-2026-111171

CVE.ORG link : CVE-2026-111171

JSON object : View

Products Affected

No product.

CWE

CWE-918

Server-Side Request Forgery (SSRF)

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