1.6.1 / 2024-12-02

1.6.1 / 2024-12-02

This is a performance and security release which addresses several possible XSS vulnerabilities.

• The dependency on Nokogiri is updated to v1.15.7 or >=1.16.8.

  This change addresses CVE-2024-53985 (GHSA-w8gc-x259-rc7x).

  Mike Dalessio

• Disallowed tags will be pruned when they appear in foreign content (i.e. SVG or MathML content),
  regardless of the prune: option value. Previously, disallowed tags were "stripped" unless the
  gem was configured with the prune: true option.

  The CVEs addressed by this change are:

  • CVE-2024-53986 (GHSA-638j-pmjw-jq48)
  • CVE-2024-53987 (GHSA-2x5m-9ch4-qgrr)

  Mike Dalessio

• The tags "noscript", "mglyph", and "malignmark" will not be allowed, even if explicitly added to
  the allowlist. If applications try to allow any of these tags, a warning is emitted and the tags
  are removed from the allow-list.

  The CVEs addressed by this change are:

  • CVE-2024-53988 (GHSA-cfjx-w229-hgx5)
  • CVE-2024-53989 (GHSA-rxv5-gxqc-xx8g)

  Please note that we may restore support for allowing "noscript" in a future release. We do not
  expect to ever allow "mglyph" or "malignmark", though, especially since browser support is minimal
  for these tags.

  Mike Dalessio

• Improve performance by eliminating needless operations on attributes that are being removed. #188

  Mike Dalessio