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CVE-2026-53754— Crawl4AI: SSRF filter bypass in Docker server via IPv6 transition forms (NAT64 / 6to4 / unspecified / v4-mapped)

Quick assessment

Affected
unclecode crawl4ai
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

UncleCode Crawl4AI是新加坡UncleCode个人开发者的一款AI驱动的爬虫软件。 UncleCode Crawl4AI 0.8.8之前版本存在服务端请求伪造漏洞，该漏洞源于Docker API服务器的SSRF保护使用明确IP地址列表但遗漏多个地址族，可能导致攻击者通过编码内部IPv4地址或使用IPv6未指定地址绕过过滤访问内部服务和云元数据端点。

CVSS 7.5 · High EPSS 0.43% · P36

Affected Version Matrix 1

VendorProduct Version RangeStatus
unclecode crawl4ai < 0.8.8 affected
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I. Basic Information for CVE-2026-53754

Vulnerability Information
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Vulnerability Title
Crawl4AI: SSRF filter bypass in Docker server via IPv6 transition forms (NAT64 / 6to4 / unspecified / v4-mapped)
Source: CVE Program / CVE List V5
Vulnerability Description
Crawl4AI is an open-source LLM friendly web crawler & scraper. Prior to 0.8.8, the Docker API server's SSRF protection (validate_webhook_url / validate_url_destination in deploy/docker/utils.py) used an explicit IPv4/IPv6 CIDR blocklist that missed several address families. An attacker could reach internal services and cloud metadata endpoints (e.g. 169.254.169.254) despite the filter by encoding an internal IPv4 address inside an IPv6 transition form, or by using the IPv6 unspecified address. Because the Docker API is unauthenticated by default (jwt_enabled: false), no credentials are required. This vulnerability is fixed in 0.8.8.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
UncleCode Crawl4AI 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
UncleCode Crawl4AI是新加坡UncleCode个人开发者的一款AI驱动的爬虫软件。 UncleCode Crawl4AI 0.8.8之前版本存在服务端请求伪造漏洞，该漏洞源于Docker API服务器的SSRF保护使用明确IP地址列表但遗漏多个地址族，可能导致攻击者通过编码内部IPv4地址或使用IPv6未指定地址绕过过滤访问内部服务和云元数据端点。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
unclecode crawl4ai < 0.8.8 -

II. Public POCs for CVE-2026-53754

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8970 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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III. Intelligence Information for CVE-2026-53754

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Vendor Advisories for CVE-2026-53754 (1)

Same Patch Batch · unclecode · 2026-06-23 · 3 CVEs total

CVE-2026-53753 9.8 CRITICAL Crawl4AI: AST Sandbox Escape via gi_frame.f_back Chain - Pre-Auth RCE in Docker API
CVE-2026-53755 8.6 HIGH Crawl4AI: SSRF via proxy settings in the Docker server bypasses the crawl-URL SSRF check

IV. Related Vulnerabilities

Same product: crawl4ai
Same vendor: unclecode
Same weakness: CWE-918

V. Comments for CVE-2026-53754

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