Bump dompurify from 3.3.3 to 3.4.0

[dependabot]

Bumps dompurify from 3.3.3 to 3.4.0.

Release notes

Sourced from dompurify's releases.

DOMPurify 3.4.0

Most relevant changes:

• Fixed a problem with FORBID_TAGS not winning over ADD_TAGS, thanks @​kodareef5
• Fixed several minor problems and typos regarding MathML attributes, thanks @​DavidOliver
• Fixed ADD_ATTR/ADD_TAGS function leaking into subsequent array-based calls, thanks @​1Jesper1
• Fixed a missing SAFE_FOR_TEMPLATES scrub in RETURN_DOM path, thanks @​bencalif
• Fixed a prototype pollution via CUSTOM_ELEMENT_HANDLING, thanks @​trace37labs
• Fixed an issue with ADD_TAGS function form bypassing FORBID_TAGS, thanks @​eddieran
• Fixed an issue with ADD_ATTR predicates skipping URI validation, thanks @​christos-eth
• Fixed an issue with USE_PROFILES prototype pollution, thanks @​christos-eth
• Fixed an issue leading to possible mXSS via Re-Contextualization, thanks @​researchatfluidattacks and others
• Fixed an issue with closing tags leading to possible mXSS, thanks @​frevadiscor
• Fixed a problem with the type dentition patcher after Node version bump
• Fixed freezing BS runs by reducing the tested browsers array
• Bumped several dependencies where possible
• Added needed files for OpenSSF scorecard checks

Published Advisories are here: https://github.com/cure53/DOMPurify/security/advisories?state=published

Commits

• 5b16e0b Getting 3.x branch ready for 3.4.0 release (#1250)
• See full diff in compare view

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Project	Deployment	Actions	Updated (UTC)
simplypdf	Ready	Preview, Comment	Apr 20, 2026 1:58pm

[ArshVermaGit]

This is a valuable security-focused upgrade that helps ensure HTML sanitization remains robust against evolving XSS vectors. Moving DOMPurify from 3.3.3 to 3.4.0 brings the latest fixes and improvements to the sanitization engine, which is especially important wherever user-provided or external HTML content is rendered. Since DOMPurify often sits directly on the trust boundary, keeping it current helps reduce exposure to newly discovered bypass techniques while maintaining compatibility with modern browser behavior. The update scope is minimal and well-suited for Dependabot’s automated conflict handling, making this a low-risk but high-impact maintenance improvement.