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Vulnerability Database · PyPI · Package report

html5lib: vulnerability history, versions and safety

html5lib is a package in the PyPI ecosystem. Vulert records 4 vulnerabilities for it across 27 releases, from Feb 2017 to May 2022. Each vulnerability names the versions it affects, the fixed version to move to, and a workaround where no fix has been published.

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4 vulnerabilities recorded M2 U2
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0 with no fix published

Every vulnerability has a patched version to move to.

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0 in the last 12 months

Nothing new recorded in the last year.

See the disclosure history →
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0 malicious-package vulnerabilities

No published version shipped hostile code.

See all html5lib vulnerabilities

Vulert verdict on html5lib 1.1.0 i

Updated on 23 Oct 2026

Action needed: 1.1.0 has 2 known vulnerabilities, but every one of them has a fix. Upgrade to the version listed below and you are clear.

Package health score 69/100
  • Security Minor issues
  • Maintenance Slowing
  • Popularity Widely used
  • Community Quiet

What to do: Upgrade to the version that resolves each vulnerability below. Fix it, then keep watch: this version is affected today, and the next one may be too — Vulert alerts you when a new vulnerability lands. Monitor it with Vulert →

  • Current release 1.1.0 — affected i
  • Vulnerabilities on record 4 over 5 years · 0 in the last year i
  • Latest disclosure 17 May 2022 i
  • Highest CVSS 6.1 i
  • With no published fix 0 i
  • Depended on by 3,306 packages i
  • Stars 1,223 i
  • OpenSSF scorecard 3/10 i
  • Last release 76 months ago i
  • Licence MIT i

Version list, release dates, licence and dependants published by PyPI, refreshed 22 Oct 2026. Licence information is not legal advice.

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01 Versions

Which versions are affected

Every version Vulert tracks for html5lib, newest first, with the vulnerabilities recorded against each one. A version showing none has no vulnerability in the Vulert database — open it for the full picture on that release.

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Version Released Vulert vulnerabilities Licence Fix published Details
1.1.0 22 Jun 2020 U2 MIT Yes Details →
1.0.1 07 Dec 2017 U2 MIT Yes Details →
1.0.0b10 27 Oct 2016 U2 MIT Yes Details →
0.999999999.0 27 Oct 2016 U2 MIT Yes Details →
1.0.0b9 14 Jul 2016 U2 MIT Yes Details →
0.99999999.0 14 Jul 2016 M1 U2 MIT Yes Details →
1.0.0b8 09 Sep 2015 U2 MIT Yes Details →
0.9999999.0 09 Sep 2015 M2 U2 MIT Yes Details →
0.999999.0 07 Jul 2015 M2 U2 MIT Yes Details →
1.0.0b7 07 Jul 2015 U2 MIT Yes Details →
0.99999.0 30 Apr 2015 M2 U2 MIT Yes Details →
1.0.0b6 30 Apr 2015 U2 MIT Yes Details →
1.0.0b5 29 Apr 2015 U2 MIT Yes Details →
0.9999.0 29 Apr 2015 M2 U2 MIT Yes Details →
0.999.0 23 Dec 2013 M2 U2 MIT Yes Details →
0.99.0 10 Sep 2013 M2 U2 MIT Yes Details →
1.0.0b3 24 Jul 2013 U2 MIT Yes Details →
0.2.0 30 Jun 2013 M2 U2 — Yes Details →
0.9.0 30 Jun 2013 M2 U2 — Yes Details →
0.11.1 30 Jun 2013 M2 U2 — Yes Details →
0.11.0 30 Jun 2013 M2 U2 — Yes Details →
1.0.0b2 27 Jun 2013 U2 MIT Yes Details →
0.10.0 21 May 2013 M2 U2 — Yes Details →
0.90.0 21 May 2013 M2 U2 — Yes Details →
1.0.0b1 17 May 2013 U2 MIT Yes Details →
0.95.0 11 Feb 2012 M2 U2 MIT Yes Details →
1.0-reupload — U2 MIT Yes Details →

All 27 versions Vulert tracks for this package. Severity counts are the vulnerabilities recorded against that exact release.

02 Disclosure history

How often vulnerabilities are recorded

  • 2017 2
  • 2022 2

Counted by the year Vulert recorded each vulnerability — the same date the table below shows as disclosed. 0 of the 4 were recorded in the last 12 months.

03 Vulnerabilities

Recorded vulnerabilities for html5lib

The 4 most severe of 4 vulnerabilities recorded for this package

Search all 4 in the database →
Vulnerability Severity Fixed version ↓ Disclosed ↓
CVE-2016-9909: Cross-Site Scripting (XSS) in html5lib 6.1 medium 0.999999999 17 May 2022
CVE-2016-9910: Cross-site Scripting in html5lib 6.1 medium 0.99999999 17 May 2022
CVE-2016-9910: Cross-Site Scripting (XSS) in html5lib N/A unrated 9b8d8eb5afbc066b7fac9390f5ec75e5e8a7cab7 22 Feb 2017
CVE-2016-9909: Cross-Site Scripting (XSS) in html5lib N/A unrated 9b8d8eb5afbc066b7fac9390f5ec75e5e8a7cab7 22 Feb 2017

Vulnerability wrong, a fix missing, or a package we should cover? Report it and we will fix the record. Report Vulnerability Provide Feedback

Updated: 23/Oct/2026 · Vulnerabilities in our DB: 524315

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Questions

About html5lib

Is html5lib safe to use?

Vulert records 4 vulnerabilities for html5lib in PyPI: 0 critical, 0 high, 2 medium and 0 low, plus 2 not yet rated. Every one of them has a published fix, so the practical answer is to run a supported release and keep it patched.

What is html5lib's Vulert package health score?

Vulert scores html5lib 69/100, which reads as usable, but worth attention. The score weighs the vulnerability record (40), maintenance and release cadence (25), adoption from dependents and stars (20) and community signals such as the OpenSSF scorecard and forks (15).

Is the latest version of html5lib affected?

Yes. 1.1.0, the version you would install today, has 2 known vulnerabilities, and every one of them has a published fix. Upgrade to the version listed for each.

Which version of html5lib should I use?

1.1.0 is the version Vulert recommends for the affected releases. The version table above lists every release with the vulnerabilities recorded against it, so you can confirm the range you actually run.

How many vulnerabilities does html5lib have?

4 vulnerabilities are recorded for html5lib in the PyPI ecosystem: 0 critical, 0 high, 2 medium and 0 low, plus 2 not yet rated. The ledger on this page lists the same counts next to the date of the most recent disclosure.

How often are new html5lib vulnerabilities disclosed?

0 vulnerabilities were recorded for html5lib in the last 12 months, and the oldest entry in this database dates to 22 Feb 2017. Recency matters more than a lifetime total: it shows how actively new issues are being disclosed for the package you are considering.

Which versions of html5lib are affected?

Each vulnerability on this page lists the affected version range and the fixed version to move to. Open the vulnerability for the version you actually run — fixes are specific to a release line, not to the package as a whole.

How do I monitor html5lib for upcoming vulnerabilities?

Upload the manifest or SBOM for your application at vulert.com/scanner and Vulert keeps checking the html5lib version you actually run against new disclosures, then alerts you when one affects it. There is no installation and no source-code access required.