CVE-2026-56266: Crawl4AI before 0.8.7 contains a server-side request forgery vulnerability in the /crawl, /crawl/stream, /md,

Q: How do I fix CVE-2026-56266?

crawl4ai: upgrade to 0.8.7. Exact commands for each OS are on this page.

Q: Is CVE-2026-56266 being exploited?

CVE-2026-56266 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-56266 affect?

CVE-2026-56266 affects crawl4ai. Severity is high (CVSS 8.6). 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-a

Q: How urgent is CVE-2026-56266?

Priority 45/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 8.6REMOTEUPGRADE

CVE-2026-56266 is a high-severity flaw (CVSS 8.6) affecting crawl4ai. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.6 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-918
Published	2026-06-22
Last modified	2026-10-25

Publisher (CNA): VulnCheck · Vendor: kidocode

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-22 22:16 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

kidocode crawl4ai UPGRADE

Affected: < 0.8.7

Fixed in: 0.8.7

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy crawl4ai || rpm -q crawl4ai || crawl4ai --version

2. UPGRADE to 0.8.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade crawl4ai

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade crawl4ai

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-56266?

crawl4ai: upgrade to 0.8.7. Exact commands for each OS are on this page.

Is CVE-2026-56266 being exploited?

CVE-2026-56266 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-56266 affect?

CVE-2026-56266 affects crawl4ai. Severity is high (CVSS 8.6). 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-a

How urgent is CVE-2026-56266?

Priority 45/100. High severity; Remotely exploitable, no login, no user action

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References

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