CVE-2024-34078

Summary

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.

Affected Software

Weaknesses

• CWE-79: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

CVE Program Container

Additional References

• https://github.com/matthiask/html-sanitizer/security/advisories/GHSA-wvhx-q427-fgh3
• https://github.com/matthiask/html-sanitizer/commit/48db42fc5143d0140c32d929c46b802f96913550
• https://lists.debian.org/debian-lts-announce/2024/08/msg00000.html

References

• https://github.com/matthiask/html-sanitizer/security/advisories/GHSA-wvhx-q427-fgh3
• https://github.com/matthiask/html-sanitizer/commit/48db42fc5143d0140c32d929c46b802f96913550

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