CVE & CISA-KEV Catalog

CVE-2026-53753

CRITICAL
9.8
CVSS v3
NVD

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.

CWE-94Code InjectionCWE-913

How to fix

Remediation Available
crawl4aiNVD
Affected:< 0.8.7Fixed in:0.8.7CVE-2026-53753derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

0.45%probability of exploitation in 30 days
36thpercentile

Low risk: more likely to be exploited than 36% of all known CVEs.

References

Mitigation1

Related Vulnerabilities

Other CWE-94 (Code Injection) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2017-9841Critical9.8100%KEVFix
CVE-2015-1635Critical9.8100%KEV-
CVE-2022-22954Critical9.8100%KEV + Ransom-
CVE-2025-3248Critical9.8100%KEV + RansomFix
CVE-2021-22204Medium6.8100%KEVFix
CVE-2012-0158High8.8100%KEV-
Embed a live status badge for CVE-2026-53753
CVE-2026-53753 severity badge

Markdown

[![CVE-2026-53753](https://tridentstack.com/cve/badge/CVE-2026-53753.svg)](https://tridentstack.com/cve/CVE-2026-53753)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-53753"><img src="https://tridentstack.com/cve/badge/CVE-2026-53753.svg" alt="CVE-2026-53753"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

See how it worksStart freeThis CVE lookup is free and always will be.

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-29.