CVE-2026-56258
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedCrawl4AI before 0.8.8 contains an arbitrary file write vulnerability in the screenshot and PDF endpoints that allows unauthenticated attackers to write files outside the intended directory via symlink and time-of-check-time-of-use (TOCTOU) attacks on the output_path parameter. Remote attackers can exploit insufficient path validation and symlink following to achieve arbitrary file write and potential code execution on systems where the runtime user has write access to executable or cron locations.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceCrawl4AI before 0.8.8 has an arbitrary file write vulnerability in screenshot and PDF endpoints. Attackers can exploit insufficient path validation combined with symlink and TOCTOU (time-of-check-time-of-use) attacks on the output_path parameter to write files outside the intended directory. This allows remote unauthenticated code execution on systems where the runtime user has write access to executable or cron locations.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 0.8.8CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- High
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify Crawl4AI installation and versionRun 'pip show crawl4ai' or check package.json/package-lock.json for crawl4ai version. If running as a service, check the startup banner or /api/version endpoint if available.Affected if The installed version is before 0.8.8
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Confirm screenshot endpoint is accessibleMake a GET request to /screenshot or /api/screenshot (exact path may vary) without authentication. Check if the endpoint responds.Affected if The endpoint is accessible and accepts an output_path parameter without validation
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Confirm PDF endpoint is accessibleMake a GET or POST request to /pdf or /api/pdf (exact path may vary) without authentication. Check if the endpoint responds.Affected if The endpoint is accessible and accepts an output_path parameter without validation
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Inspect output_path parameter handlingReview the source code or configuration for screenshot/PDF handlers. Look for path validation logic on the output_path parameter. Check if path traversal sequences like '../' are blocked.Affected if No path validation exists, or validation can be bypassed via symlink/TOCTOU attacks
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Check runtime user file permissionsIdentify the user running the Crawl4AI process (ps aux | grep crawl4ai). Check write access to sensitive directories like /etc/cron.d, /usr/local/bin, or service configuration directories.Affected if The runtime user has write access to executable paths or cron directories, allowing code execution if file write is achieved
Your environment is affected if running Crawl4AI version before 0.8.8 with screenshot or PDF endpoints exposed and no path validation on the output_path parameter.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped0.8.8
Upgrade to Crawl4AI 0.8.8 or later. Additionally, implement strict path validation to prevent directory traversal and disable symlink following for the output_path parameter.
Crawl4ai version 0.8.8 or later
- 1. Identify all Crawl4ai instances currently running version < 0.8.8
- 2. Review the application architecture to determine if screenshot and PDF generation features are exposed to unauthenticated users
- 3. If immediate upgrade is not possible, temporarily disable or restrict access to screenshot and PDF endpoints at the network or application level
- 4. Back up current Crawl4ai configuration and data before performing upgrade
- 5. Upgrade Crawl4ai to version 0.8.8 or later using the appropriate package manager or installation method (e.g., pip install crawl4ai==0.8.8 or docker pull)
- 6. After upgrade, verify the path validation fix is working by testing with a symlink-based path traversal attempt on the output_path parameter
- 7. Review application logs for any signs of exploitation attempts prior to patching
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation4.0 h
- Testing2.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2026-56258 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-56258 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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