CVE-2026-53753: Crawl4AI is an open-source LLM friendly web crawler & scraper

Q: How do I fix CVE-2026-53753?

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

Q: Is CVE-2026-53753 being exploited?

CVE-2026-53753 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-2026-53753 affect?

CVE-2026-53753 affects crawl4ai. Severity is critical (CVSS 9.8). 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

Q: How urgent is CVE-2026-53753?

Priority 67/100. Critical severity; CISA SSVC: public proof of concept; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-53753 is a critical-severity flaw (CVSS 9.8) affecting crawl4ai. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 disabl

Why this priority

Critical severity
CISA SSVC: public proof of concept
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.9% (top 13%)
CISA exploited list	No
Weakness	CWE-94, CWE-913
Published	2026-06-23
Last modified	2026-10-25

Publisher (CNA): GitHub, Inc. · Vendor: kidocode

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

Am I affected?

Timeline

2026-06-23 19:17 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.

Exact fixes by distribution

Python (pip) · crawl4ai · FIXED · 0.8.7 · vulnerable: <= 0.8.6 · source

pip install --upgrade "crawl4ai>=0.8.7" pip show crawl4ai

Fedora 46 · mingw-qt5-qtwebkit · FIXED · 5.212.0-0.46.alpha4.fc46 · FEDORA-2026-46ae541c22 · source

sudo dnf upgrade --advisory=FEDORA-2026-46ae541c22

Fedora ELN · kdominate · FIXED · 26.08.2-2.eln159 · FEDORA-2026-b1d98239fd · source

sudo dnf upgrade --advisory=FEDORA-2026-b1d98239fd

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: BiiTts/CVE-2026-53753-Crawl4AI-RCE (4 stars)
GitHub PoC: 0xEnc0der/CVE-2026-53753 (0 stars)
Nuclei scan template: Crawl4AI <= 0.8.6 - Remote Code Execution

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-2026-53753?

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

Is CVE-2026-53753 being exploited?

CVE-2026-53753 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-2026-53753 affect?

CVE-2026-53753 affects crawl4ai. Severity is critical (CVSS 9.8). 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

How urgent is CVE-2026-53753?

Priority 67/100. Critical severity; CISA SSVC: public proof of concept; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Software pages

Python vulnerabilities

Related CVEs

CVE-2026-53755 HIGH 8.6 UPGRADE Crawl4AI is an open-source LLM friendly web crawler & scraper
CVE-2026-56266 HIGH 8.6 UPGRADE Crawl4AI before 0.8.7 contains a server-side request forgery vulnerability in the /crawl, /crawl/stream, /md,
CVE-2026-53754 HIGH 7.5 UPGRADE Crawl4AI is an open-source LLM friendly web crawler & scraper
CVE-2026-57572 CRITICAL 10.0 UPGRADE Crawl4AI is an open-source LLM-friendly web crawler and scraper
CVE-2026-57571 CRITICAL 9.6 UPGRADE Crawl4AI is an open-source LLM-friendly web crawler and scraper

References

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