What is GHSA-wvhx-q427-fgh3?

GHSA-wvhx-q427-fgh3 is a security advisory published by GitHub Security Advisories with High severity. Arbitrary HTML present after sanitization because of unicode normalization

Which CVE IDs does GHSA-wvhx-q427-fgh3 cover?

GHSA-wvhx-q427-fgh3 covers the following CVE IDs: CVE-2024-34078. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

Which products are affected by GHSA-wvhx-q427-fgh3?

GHSA-wvhx-q427-fgh3 affects 1 product, including: pip/html-sanitizer:\u003c 2.4.2.

GHSA-wvhx-q427-fgh3High

Arbitrary HTML present after sanitization because of unicode normalization

Vendor

GitHub Security Advisories

Published

May 6, 2024

Last Modified

May 6, 2024

🔗 CVE IDs covered (1)

CVE-2024-34078 →

📋 Description

Impact

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.

Patches

The problem has been fixed in 2.4.2.

Workarounds

Set keep_typographic_whitespace=True explicitly, or normalize to NFKC yourself earlier.

🎯 Affected products1

pip/html-sanitizer:< 2.4.2

🔗 References (3)

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