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CVE-2026-115411— crawlseo before 0.2.4 Server-Side Request Forgery via Crawler

Quick assessment

Affected
crawlseo crawlseo
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.

crawlseo 在 0.2.4 版本之前存在服务端请求伪造（SSRF）漏洞，位于其爬虫引擎中。该漏洞源于 isPrivateIp() 函数未能正确拦截保留 IP 地址段，例如 RFC 6598 定义的运营商级 NAT（CGNAT）地址、RFC 6890 定义的保留地址、TEST-NET 地址段以及某些 IPv6 地址。此外，该函数还未能将已验证的地址固定用于实际的外发连接，从而允许攻击者利用“时间差”（TOCTOU）DNS 重绑定技术绕过防护。 已认证的攻击者可以添加一个恶意域名，该域名解析到内部或受限地址，随后

CVSS 5.0 · Medium
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I. Basic Information for CVE-2026-115411

Vulnerability Information
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Vulnerability Title
crawlseo before 0.2.4 Server-Side Request Forgery via Crawler
Source: CVE Program / CVE List V5
Vulnerability Description
crawlseo before version 0.2.4 contains a server-side request forgery vulnerability in its crawler engine where isPrivateIp() fails to block reserved IP ranges such as RFC 6598 Carrier-Grade NAT, RFC 6890, TEST-NET ranges and certain IPv6 addresses, and additionally fails to pin the validated address for the actual outbound connection, allowing a TOCTOU DNS rebinding bypass. An authenticated attacker can add a malicious domain that resolves to an internal or restricted address, trigger a crawl to reach internal services or cloud metadata endpoints like 169.254.169.254, and retrieve the fetched page's title, description, headings, status code and links through the crawl results API, enabling internal network reconnaissance.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/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

Affected Products

Vendor Product Affected Versions CPE Subscribe
crawlseo crawlseo 0.1.0 ~ 0.2.4 -

II. Public POCs for CVE-2026-115411

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III. Intelligence Information for CVE-2026-115411

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Other References for CVE-2026-115411 (4)

IV. Related Vulnerabilities

Same product: crawlseo
Same vendor: crawlseo
Same weakness: CWE-918

V. Comments for CVE-2026-115411

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