CVE-2026-111171 Web3.py 7.15.0 through 7.16.0 and 8.0.0b2 through 8.0.0 CCIP-Read SSRF Bypass
Attackers can bypass IP restrictions in Web3.py CCIP Read to access internal services via IPv4-mapped IPv6 addresses.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-111171?
CVE-2026-111171 is a medium-severity server-side request forgery vulnerability in ethereum web3.py, published on 15 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-918
Which versions are affected by CVE-2026-111171?
How do I fix CVE-2026-111171?
Upgrade to a fixed version.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-111171 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-111171 exists.
Sources
Also known as GHSA-w8h5-xcmp-474f.