CVE-2016-9909

6.1 MEDIUM

Published: February 22, 2017 Modified: May 13, 2026

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.

AI Explanation

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0

Vector String

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory

http://www.openwall.com/lists/oss-security/2016/12/06/5

Source: secalert@redhat.com

Mailing List Patch Third Party Advisory

http://www.openwall.com/lists/oss-security/2016/12/08/8

Source: secalert@redhat.com

Mailing List Patch Third Party Advisory

http://www.securityfocus.com/bid/95132

Source: secalert@redhat.com

Third Party Advisory VDB Entry

https://github.com/html5lib/html5lib-python/commit/9b8d8eb5afbc066b7fac9390f5ec75e5e8a7cab7

Source: secalert@redhat.com

Patch

https://github.com/html5lib/html5lib-python/issues/11

Source: secalert@redhat.com

Vendor Advisory

https://github.com/html5lib/html5lib-python/issues/12

Source: secalert@redhat.com

Vendor Advisory

https://html5lib.readthedocs.io/en/latest/changes.html#b9

Source: secalert@redhat.com

Release Notes

http://www.openwall.com/lists/oss-security/2016/12/06/5