CVE-2026-56266Network attack vector

Unauthenticated internal-service access via IPv6-mapped URLs

Published Jun 22, 2026 · Updated Jun 22, 2026

Server-side request forgery in Crawl4AI before 0.8.7 allows remote attackers to access internal services through direct crawl endpoints. The /crawl, /crawl/stream, /md, and /llm handlers fetch user-supplied URLs without destination validation, while literal-host blocklisting fails to normalize IPv6-mapped IPv4 addresses. No authentication is required, exposing internal services and cloud metadata endpoints to read access through the server.

CVSS severity9.2
Critical
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side request forgery in Crawl4AI before 0.8.7 allows remote attackers to access internal services through direct crawl endpoints. The /crawl, /crawl/stream, /md, and /llm handlers fetch user-supplied URLs without destination validation, while literal-host blocklisting fails to normalize IPv6-mapped IPv4 addresses. No authentication is required, exposing internal services and cloud metadata endpoints to read access through the server.

The record

CVE
CVE-2026-56266
Published
Jun 22, 2026
Updated
Jun 22, 2026
Vendor
Crawl4AI
Product
Crawl4AI
Classifications
CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <0.8.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Crawl4AI · Crawl4AIversion=0 <0.8.7

Published CVSS scores

9.2VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
8.6VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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