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CVE-2026-53753

Kidocode Crawl4ai code injection

9.8 CRITICALEPSS 2.90%
  1. Published23 Jun 2026

Description

Crawl4AI is an open-source LLM friendly web crawler & scraper. Prior to 0.8.7, the _safe_eval_expression() function in the computed fields feature uses an AST validator that only blocks attributes starting with underscore. Python generator and frame object attributes (gi_frame, f_back, f_builtins) do NOT start with underscore, enabling a complete sandbox escape to achieve arbitrary code execution. The attack requires no authentication (JWT disabled by default) and is triggered via POST /crawl with a crafted extraction schema. This vulnerability is fixed in 0.8.7.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Kidocode Crawl4ai< 0.8.7

Remediation

Fixed in
Kidocode Crawl4ai≥ 0.8.7

References

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Frequently asked

Is CVE-2026-53753 being actively exploited?

CVE-2026-53753 is not in the CISA KEV catalog. Its EPSS exploit probability is 2.90%.

How severe is CVE-2026-53753?

CVE-2026-53753 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 2.90% probability of exploitation.

Which products are affected by CVE-2026-53753?

Affected products include Kidocode Crawl4ai.

How do I fix CVE-2026-53753?

Upgrade affected software to a fixed version, for example Kidocode Crawl4ai 0.8.7 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-53753 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.