---
id: CVE-2026-115411
title: crawlseo before 0.2.4 Server-Side Request Forgery via Crawler
summary: >-
  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…
severity: medium
cvss: 5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N'
cvssSource: cna
cwe:
  - CWE-918
vendor: crawlseo
product: crawlseo
affected:
  - crawlseo >= 0.1.0 < 0.2.4
published: '2026-10-22'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T13:28:36.246Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-115411'
references:
  - url: >-
      https://github.com/crawlseo/crawlseo/commit/76e4e693de0c6b294cf1f60656800e47346f1c28
  - url: 'https://github.com/crawlseo/crawlseo/releases?page=1#release-v0.2.4'
    label: Vendor Patch
  - url: 'https://gist.github.com/mansurmavlankulov/47cb8e183fec39a7afe599d1082a3399'
  - url: >-
      https://www.vulncheck.com/advisories/crawlseo-before-server-side-request-forgery-via-crawler
    label: >-
      VulnCheck Advisory: crawlseo before 0.2.4 Server-Side Request Forgery via
      Crawler
tags:
  - cve.org
ingestedAt: '2026-10-22T22:00:50.265Z'
---

## Overview

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.

## Affected

- `crawlseo >= 0.1.0 < 0.2.4`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.