How severe is CVE-2026-53753?

CVE-2026-53753 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-53753 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-53753?

CVE-2026-53753 affects Kidocode Crawl4ai. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-53753?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-53753 have an EU (EUVD) identifier?

Yes. CVE-2026-53753 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38569.

When was CVE-2026-53753 published?

CVE-2026-53753 was published on 2026-06-23 and last updated on 2026-06-29.

CVE-2026-53753

CVE-2026-53753 is a critical-severity vulnerability in Kidocode Crawl4ai with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-94.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-38569
Weakness: CWE-94
Affected product: Kidocode Crawl4ai
Published: 2026-06-23
Last modified: 2026-06-29

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.

Frequently asked questions

What is CVE-2026-53753?: 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.
How severe is CVE-2026-53753?: CVE-2026-53753 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-53753 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-53753?: CVE-2026-53753 affects Kidocode Crawl4ai. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-53753?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-53753 have an EU (EUVD) identifier?: Yes. CVE-2026-53753 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38569.
When was CVE-2026-53753 published?: CVE-2026-53753 was published on 2026-06-23 and last updated on 2026-06-29.

References

https://github.com/unclecode/crawl4ai/security/advisories/GHSA-qxjp-w3pj-48m7

Affected products (1)

cpe:2.3:a:kidocode:crawl4ai:*:*:*:*:*:*:*:*

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