Medium severity6.1NVD Advisory· Published Feb 22, 2017· Updated Jun 17, 2026
CVE-2016-9909
CVE-2016-9909
Description
The serializer in html5lib before 0.99999999 might allow remote attackers to conduct cross-site scripting (XSS) attacks by leveraging mishandling of the < (less than) character in attribute values.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
html5libPyPI | < 0.999999999 | 0.999999999 |
Affected products
2Patches
Vulnerability mechanics
References
11- www.openwall.com/lists/oss-security/2016/12/06/5nvdMailing ListPatchThird Party AdvisoryWEB
- www.openwall.com/lists/oss-security/2016/12/08/8nvdMailing ListPatchThird Party AdvisoryWEB
- github.com/html5lib/html5lib-python/commit/9b8d8eb5afbc066b7fac9390f5ec75e5e8a7cab7nvdPatchWEB
- www.securityfocus.com/bid/95132nvdThird Party AdvisoryVDB Entry
- github.com/advisories/GHSA-v9v9-xffq-rwr4ghsaADVISORY
- github.com/html5lib/html5lib-python/issues/11nvdVendor AdvisoryWEB
- github.com/html5lib/html5lib-python/issues/12nvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2016-9909ghsaADVISORY
- github.com/pypa/advisory-database/tree/main/vulns/html5lib/PYSEC-2017-14.yamlghsaWEB
- html5lib.readthedocs.io/en/latest/changes.htmlnvdRelease NotesWEB
- web.archive.org/web/20161229134056/http://www.securityfocus.com/bid/95132ghsaWEB
News mentions
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