CVE-2024-34078CWE-79

html-sanitizer allows arbitrary HTML present after sanitization because of unicode normalization

Medium · published May 6, 2024

CVSS v3.1
6.1
EPSS
1%
Percentile
45.6
In the wild
Unconfirmed
What it is

html-sanitizer is an allowlist-based HTML cleaner. If using `keep_typographic_whitespace=False` (which is the default), the sanitizer normalizes unicode to the NFKC form at the end. Some unicode characters normalize to chevrons; this allows specially crafted HTML to escape sanitization. The problem has been fixed in 2.4.2.

The record
Technical detail
CVSS v3.1
6.1 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00555 · 45.6th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2024-05-06T14:48Z
EPSS history
Timeline
  • 06 MAY 14:48Z
    html-sanitizer allows arbitrary HTML present after sanitization because of unicode normalization
    cvelistv5