This is the documentation for version 2.6. Please consider upgrading your code to the latest stable version

Changelog

All notable changes made in 2.x releases are shown below. See the full list of releases for the complete changelog.

2.7.0 - 2025-05-05

This is a security release to address a potential cross-site scripting (XSS) vulnerability when using the AttributesExtension with untrusted user input.

Added

• Added attributes/allow config option to specify which attributes users are allowed to set on elements (default allows virtually all attributes)

Changed

• The AttributesExtension blocks all attributes starting with on unless explicitly allowed via the attributes/allow config option
• The allow_unsafe_links option is now respected by the AttributesExtension when users specify href and src attributes

2.6.2 - 2025-04-18

Fixed

• Fixed Attributes extension parsing regression (#1071)

Other Changes

• fix incorrect interface in docs v2.6 by @CharrafiMed in https://github.com/thephpleague/commonmark/pull/1063
• docs/2.6/extensions/front-matter.md: add missing newline by @DanielEScherzer in https://github.com/thephpleague/commonmark/pull/1069

New Contributors

• @CharrafiMed made their first contribution in https://github.com/thephpleague/commonmark/pull/1063
• @DanielEScherzer made their first contribution in https://github.com/thephpleague/commonmark/pull/1069

Full Changelog: https://github.com/thephpleague/commonmark/compare/2.6.1…2.6.2

2.6.1 - 2024-12-29

Fixed

• Rendered list items should only add newlines around block-level children (#1059, #1061)

Full Changelog: https://github.com/thephpleague/commonmark/compare/2.6.0…2.6.1

2.6.0 - 2024-12-07

This is a security release to address potential denial of service attacks when parsing specially crafted, malicious input from untrusted sources (like user input). See https://github.com/thephpleague/commonmark/security/advisories/GHSA-c2pc-g5qf-rfrf for more details.

Added

• Added max_delimiters_per_line config option to prevent denial of service attacks when parsing malicious input
• Added table/max_autocompleted_cells config option to prevent denial of service attacks when parsing large tables
• The AttributesExtension now supports attributes without values (#985, #986)
• The AutolinkExtension exposes two new configuration options to override the default behavior (#969, #987):
  • autolink/allowed_protocols - an array of protocols to allow autolinking for
  • autolink/default_protocol - the default protocol to use when none is specified
• Added RegexHelper::isWhitespace() method to check if a given character is an ASCII whitespace character
• Added CacheableDelimiterProcessorInterface to ensure linear complexity for dynamic delimiter processing
• Added Bracket delimiter type to optimize bracket parsing

Changed

• [ and ] are no longer added as Delimiter objects on the stack; a new Bracket type with its own stack is used instead
• UrlAutolinkParser no longer parses URLs with more than 127 subdomains
• Expanded reference links can no longer exceed 100kb, or the size of the input document (whichever is greater)
• Delimiters should always provide a non-null value via DelimiterInterface::getIndex()
  • We’ll attempt to infer the index based on surrounding delimiters where possible
• The DelimiterStack now accepts integer positions for any $stackBottom argument
• Several small performance optimizations

Older Versions

Please see the full list of releases for the complete changelog.

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