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CVE-2026-111171— Web3.py 7.15.0 through 7.16.0 and 8.0.0b2 through 8.0.0 CCIP-Read SSRF Bypass

Quick assessment

Affected
ethereum web3.py
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Web3.py 7.15.0 至 7.16.0 版本以及 8.0.0b2 至 8.0.0 版本存在一个服务器端请求伪造（SSRF）漏洞。该漏洞的原因在于，在进行 CCIP Read URL 验证时， 函数未能正确解包 IPv4 映射的 IPv6 地址。恶意合约可以通过返回包含 IPv4 映射 IPv6 主机名或 AAAA 记录的 OffchainLookup URLs，诱导启用 CCIP Read 功能的客户端向回环地址、私有网络地址或链路本地地址的服务发送请求。

CVSS 5.4 · Medium EPSS 0.34% · P26

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 2

VendorProduct Version RangeStatus
ethereum web3.py 7.15.0≤ 7.16.0 affected
8.0.0b2≤ 8.0.0 affected
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I. Basic Information for CVE-2026-111171

Vulnerability Information
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Vulnerability Title
Web3.py 7.15.0 through 7.16.0 and 8.0.0b2 through 8.0.0 CCIP-Read SSRF Bypass
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
ethereum web3.py 7.15.0 ~ 7.16.0 -

II. Public POCs for CVE-2026-111171

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III. Intelligence Information for CVE-2026-111171

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Patches & Fixes for CVE-2026-111171 (2)

Vendor Advisories for CVE-2026-111171 (2)

Vendor Pages for CVE-2026-111171 (1)

IV. Related Vulnerabilities

Same product: web3.py
Same vendor: ethereum
Same weakness: CWE-918

V. Comments for CVE-2026-111171

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