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CVE-2026-53755— Crawl4AI: SSRF via proxy settings in the Docker server bypasses the crawl-URL SSRF check

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 0.8.9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目标检查仅应用于爬取目标URL，而未应用于代理地址，可能导致未经验证攻击者通过提供指向内部IP的代理，路由浏览器访问内部服务和云元数据端点。

CVSS 8.6 · High EPSS 1.58% · P75

Public Exploits 1

Nuclei · 1 CVE-2026-53755.yaml [template]

Affected Version Matrix 1

VendorProduct Version RangeStatus
unclecode crawl4ai < 0.8.9 affected
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I. Basic Information for CVE-2026-53755

Vulnerability Information
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Vulnerability Title
Crawl4AI: SSRF via proxy settings in the Docker server bypasses the crawl-URL SSRF check
Source: CVE Program / CVE List V5
Vulnerability Description
Crawl4AI is an open-source LLM friendly web crawler & scraper. Prior to 0.8.9, the Docker API server applied its SSRF destination check to the crawl target URL only, not to the proxy address. An unauthenticated request could supply a proxy pointing at an internal IP and route the browser through it, reaching internal services and cloud-metadata endpoints, while using a perfectly valid crawl URL. The Docker API is unauthenticated by default. /crawl, /crawl/stream, and /crawl/job accept a browser_config (and crawler_config). The following all feed Chromium's egress and were unchecked: browser_config.proxy_config.server, browser_config.proxy (deprecated field), crawler_config.proxy_config.server, and --proxy-server / --proxy-pac-url / --proxy-bypass-list / --host-resolver-rules flags in browser_config.extra_args. This vulnerability is fixed in 0.8.9.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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 0.8.9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目标检查仅应用于爬取目标URL，而未应用于代理地址，可能导致未经验证攻击者通过提供指向内部IP的代理，路由浏览器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 < 0.8.9 -

II. Public POCs for CVE-2026-53755

# POC Description Source Link Shenlong Link
1 Crawl4AI < 0.8.9 contains a server-side request forgery caused by insufficient SSRF destination checks on proxy addresses in browser and crawler configurations, letting unauthenticated attackers access internal services and cloud metadata endpoints. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-53755.yaml POC Details
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 6960 chars
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III. Intelligence Information for CVE-2026-53755

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Vendor Advisories for CVE-2026-53755 (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-2026-53754 7.5 HIGH Crawl4AI: SSRF filter bypass in Docker server via IPv6 transition forms (NAT64 / 6to4 / un

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-53755

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