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Short answer: wkhtmltopdf 0.12.6 is the project’s last stated stable series, released on June 11, 2020. It is still downloadable, but it is not a modern, actively maintained browser engine. Choose a package only after checking your operating system, CPU architecture, and whether your application depends on the project’s patched-Qt features. Treat every HTML-to-PDF job as potentially dangerous when the HTML or JavaScript is not fully trusted.
The project repository is archived and read-only, and the project says its Qt 4 and WebKit components are old and out of support. Debian’s security tracker lists bookworm package 0.12.6-2 as vulnerable to CVE-2022-35583, an SSRF issue. That does not prove that every package has identical exposure, but it is a strong reason to isolate wkhtmltopdf or select a maintained renderer for new systems.
What wkhtmltopdf 0.12.6 actually is
wkhtmltopdf is a downloadable command-line program that renders HTML with a Qt/WebKit-based engine and writes a PDF. The project’s downloads page calls 0.12.6 its “current stable series” and dates the release to June 11, 2020. That wording describes the series on the downloads page; it is not a promise of continuing security maintenance.
The 0.12.6 release record is in an archived, read-only GitHub repository. The renderer therefore belongs in a legacy-compatibility category: it can be useful when an existing application was designed around its output, but it should not be treated as a current browser runtime.
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Is 0.12.6 safe for untrusted HTML?
No. The project’s own downloads page warns: “Do not use wkhtmltopdf with any untrusted HTML – be sure to sanitize any user-supplied HTML/JS, otherwise it can lead to complete takeover of the server it is running on!” This warning applies directly to services that accept templates, URLs, or HTML from customers.
Why the warning matters
- The project status page says Qt 4 has been unsupported since 2015 and that the WebKit bundled with it had not been updated since 2012.
- The status page describes security concerns around the in-process WebKit1 API.
- Debian’s security tracker marks bookworm’s 0.12.6-2 package as vulnerable to CVE-2022-35583, described there as an SSRF vulnerability.
The Debian entry is specific to that distribution and package. It is not a complete audit of every vendor build. Exposure depends on how you invoke the program, what network and filesystem access the process has, and where the binary came from.
Minimum isolation for legacy use
- Run conversion in a dedicated, unprivileged account or container.
- Permit outbound network access only when the document genuinely needs it; otherwise block it.
- Use read-only input mounts and a separate, writable output directory.
- Set CPU, memory, process, file-size, and wall-clock limits.
- Sanitize HTML and JavaScript before it reaches the renderer; do not rely on wkhtmltopdf as a sanitizer.
- Log the exact binary path, package version, arguments, exit status, and output size.
Choose the build before you install
The project distinguishes packages built with its patched Qt from distribution builds that omit those patches. Patched Qt supplies behavior that is not present in upstream Qt. A distribution package may use a later system web engine yet behave differently from the project’s packages. “Static” also does not mean that every system dependency is included; the project says a static build links Qt in that manner while other packages may still be required.
| Decision | Use this when | Trade-off |
|---|---|---|
| Project package with patched Qt | Your templates require wkhtmltopdf-specific features such as headers, footers, or other patched behavior. | Closer to documented project behavior, but you must verify its operating-system and architecture support and still manage legacy dependencies. |
| Distribution-provided package | You prioritize the distribution’s dependency and update process and your output does not require patched-Qt features. | Behavior and rendering can differ from project packages; patched-only options may be missing. |
| Retain 0.12.6 temporarily | An established workload has unacceptable output changes with another renderer. | You inherit an old engine and must compensate with isolation, pinning, and regression tests. |
| Adopt a maintained renderer | You are starting a new service or process untrusted customer content. | Migration can require template and pixel-level changes; evaluate the candidate against your own documents. |
Installation workflow by platform
Do not copy a package command until you have identified the operating system, distribution release, CPU architecture, and patched-Qt requirement. The project publishes a package matrix rather than one universal installer.
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Debian or Ubuntu
- Record the platform:
cat /etc/os-releaseanduname -m. - Inspect the repository candidate:
apt-cache policy wkhtmltopdf. - Install the distribution package only if its rendering behavior is acceptable:
sudo apt update && sudo apt install wkhtmltopdf. - Verify the executable and version:
command -v wkhtmltopdffollowed bywkhtmltopdf --version. - Capture a known test page and compare it with your application’s baseline:
wkhtmltopdf https://example.com test.pdf.
For Debian bookworm, the security tracker identifies package version 0.12.6-2. Confirm the installed revision with your package manager rather than assuming every Debian-family system has that exact build.
Other Linux distributions
Use the distribution package when dependency integration and its unpatched behavior are acceptable. If you download a project-provided archive, verify the archive’s operating-system and architecture match, keep the file’s checksum and provenance records, and install all dependencies named by that package. A static archive can still require non-Qt system libraries.
Windows and macOS
Select the project package matching the operating-system release and CPU architecture shown on the downloads page. Test installation in a clean machine or container, then run wkhtmltopdf --version and a representative document. Do not assume that a package built for one architecture or operating-system release will run correctly on another.
What changed in 0.12.6
- Local filesystem access is blocked by default. This is a breaking change for templates that read local images, stylesheets, or files; redesign them or explicitly review any local-access option before enabling it.
- Table-of-contents and other special pages missing from output were fixed in the release record.
- A Canvas
setLineDashregression was fixed. --encodingis accepted with non-patched builds.- ppc64le and 64-bit ARM support was added.
The earlier 0.12.5 history records SSL client-certificate support, fixes for crashes or blank pages during count and print phases, and fixes involving fonts, Unicode URLs, and read-only form fields. These are changelog entries, not independent proof that every vendor package behaves identically.
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Run a controlled conversion
Basic URL to PDF
wkhtmltopdf --quiet https://example.com output.pdfLocal HTML with explicit assets
Because local filesystem access is blocked by default in 0.12.6, prefer serving test assets through a controlled local HTTP endpoint or review the security implications of any local-file option. Never enable broad filesystem access for untrusted input.
Regression checklist
- Compare page count, paper size, margins, headers, footers, fonts, images, forms, and hyperlinks.
- Test JavaScript-heavy pages with a fixed timeout and a deterministic network environment.
- Test right-to-left text, Unicode URLs, SVG or Canvas content, and very long tables.
- Run the same fixture against the exact binary used in production, not merely another 0.12.6 package.
Troubleshooting common failures
“Command not found”
The executable is not on PATH or the package was not installed. Locate it with your package manager, run it by absolute path, and add only the intended directory to the service account’s PATH.
Blank pages or missing images
Check network policy, DNS, TLS compatibility, JavaScript timing, and whether assets are local files blocked by 0.12.6 defaults. Use a controlled test server and wait options where appropriate; do not solve an untrusted-input problem by granting unrestricted file or network access.
Headers, footers, or special pages do not render
You may be using a distribution build without the project’s patched Qt. Compare wkhtmltopdf --version output and package provenance, then test the project package permitted for your platform.
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Fonts or Unicode differ between machines
Install the same font set, locale, and binary revision in every worker. Record those dependencies in the image or machine definition and regenerate the baseline PDF.
Conversion hangs or consumes excessive resources
Apply an external timeout, process limits, and a bounded temporary directory. Capture stderr and the exit code. A retry loop without limits can multiply resource exhaustion.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Performance, reliability, and maintenance policy
Throughput depends on page complexity, JavaScript, fonts, network requests, and machine resources; the supplied project material does not establish a universal benchmark. For reliable service, keep a warm but disposable worker pool, cap concurrent conversions, cache immutable inputs, and retain failed HTML and logs for diagnosis without exposing sensitive data. Pin the binary and dependencies so a package refresh cannot silently alter layout.
For new development, make the renderer replaceable behind a job interface. Define acceptance tests for the PDFs your users actually receive, and set a retirement date for wkhtmltopdf rather than allowing the legacy dependency to become permanent by accident.
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Or skip the browser setup
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curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpThe same request in Python:
import requests
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open("shot.webp", "wb").write(r.content)And Node.js:
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Decision checklist
- Have you identified the exact OS, distribution, architecture, and package provenance?
- Does your template require patched-Qt behavior?
- Is all HTML and JavaScript trusted and sanitized?
- Are filesystem, network, CPU, memory, and time limits enforced?
- Have you tested the exact binary with representative documents?
- Is there a documented migration or retirement plan?
Frequently Asked Questions
Does 0.12.6 include a modern Chromium engine?
No. It uses the project’s Qt/WebKit-based legacy stack; the project describes those components as old and out of support.
Can I enable local file access to fix missing assets?
Only after reviewing the security impact in a controlled, trusted workload. Broad local access is inappropriate for untrusted HTML.
Should every Debian package be treated as identical to the upstream build?
No. Distribution builds can omit patched Qt and can differ in dependencies and behavior; verify the package and test its output.
Quick Recap
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