---
id: "CVE-2026-119119"
kind: "vulnerability"
aliases: ["CVE-2026-119119"]
title: "Crawl4AI: unbounded delay fields let unauthenticated requests exhaust the crawler"
severity: "high"
cvss: 8.7
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["crawl4ai", "docker", "package", "self-hosted"]
not_affected_if: ["auth-required", "internal-only-network", "library-only-use"]
published_at: "2026-10-29T16:18:04+00:00"
first_seen_at: "2026-10-29T16:25:57+00:00"
updated_at: "2026-10-29T16:29:21+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-119119", "first_seen_at": "2026-10-29T16:25:57+00:00"}]
---

# Crawl4AI: unbounded delay fields let unauthenticated requests exhaust the crawler

Crawl4AI's Docker API server does not cap the delay_before_return_html, mean_delay and max_range fields in crawl requests. An unauthenticated attacker can send very large values to /crawl or /crawl/stream to hold browser pages and stall the rate limiter, blocking other crawls.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Crawl4AI version with `pip show crawl4ai` or the image tag of the Docker deployment.
- Confirm whether the Docker API server is reachable from untrusted networks by checking exposed ports on the `/crawl` and `/crawl/stream` endpoints.

## Fix

- Crawl4AI versions before `0.9.5` are affected; move to `0.9.5` or later.

## Timeline

- 2026-10-29T16:25:57+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-119119

## From the sources

Crawl4AI before 0.9.5 contains a denial of service vulnerability in the Docker API server where _clamp_untrusted() fails to cap the delay_before_return_html, mean_delay, and max_range fields of untrusted CrawlerRunConfig bodies. Unauthenticated attackers can send huge values to /crawl or /crawl/stream to hold browser pages or stall the rate limiter, exhausting the page pool and blocking other crawls.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_