CVE-2026-111171CWE-918ssrf

CVE-2026-111171

Medium · published October 15, 2026

CVSS v3.1
5.4
EPSS
0%
Percentile
26.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
CVSS v4.0
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
EPSS
0.00341 · 26.4th percentile
Weakness
CWE-918 · Server-Side Request Forgery (SSRF)
Published
2026-10-15T23:17Z
References (6)
https://github.com/ethereum/web3.py · [email protected]https://github.com/ethereum/web3.py/blob/c8c1ed0c9e77e1a8b74902e6a6825e0b00534b10/web3/utils/ccip_url_validation.py#L16-L57 · [email protected]https://github.com/ethereum/web3.py/pull/3875 · [email protected]https://github.com/ethereum/web3.py/security/advisories/GHSA-5hr4-253g-cpx2 · [email protected]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 · [email protected]https://github.com/ApeWorX/web3.py/security/advisories/GHSA-5hr4-253g-cpx2 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 17 OCT 03:28Z
    EPSS moved — → 0%
    epss
  • 15 OCT 18:57Z
    Web3.py 7.15.0 through 7.16.0 and 8.0.0b2 through 8.0.0 CCIP-Read SSRF Bypass
    cvelistv5
  • 15 OCT 18:57Z
    Web3.py 7.15.0 through 7.16.0 and 8.0.0b2 through 8.0.0 CCIP-Read SSRF Bypass
    cvelistv5