🚨 [security] [php] Update league/commonmark 2.7.0 → 2.8.2 (minor)

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🚨 Your current dependencies have known security vulnerabilities 🚨

This dependency update fixes known security vulnerabilities. Please see the details below and assess their impact carefully. We recommend to merge and deploy this as soon as possible!

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Here is everything you need to know about this update. Please take a good look at what changed and the test results before merging this pull request.

What changed?

↗️ league/commonmark (indirect, 2.7.0 → 2.8.2) · Repo · Changelog

Security Advisories 🚨

🚨 league/commonmark has an embed extension allowed_domains bypass

Impact

The DomainFilteringAdapter in the Embed extension is vulnerable to an allowlist bypass due to a missing hostname boundary assertion in the domain-matching regex. An attacker-controlled domain like youtube.com.evil passes the allowlist check when youtube.com is an allowed domain.

This enables two attack vectors:

• SSRF: The OscaroteroEmbedAdapter makes server-side HTTP requests to the embed URL via the embed/embed library. A bypassed domain filter causes the server to make outbound requests to an attacker-controlled host, potentially probing internal services or exfiltrating request metadata.
• XSS: EmbedRenderer outputs the oEmbed response HTML directly into the page with no sanitization. An attacker controlling the bypassed domain can return arbitrary HTML/JavaScript in their oEmbed response, which is rendered verbatim.

Any application using the Embed extension and relying on allowed_domains to restrict domains when processing untrusted Markdown input is affected.

Patches

This has been patched in version 2.8.2. The fix replaces the regex-based domain check with explicit hostname parsing using parse_url(), ensuring exact domain and subdomain matching only.

Workarounds

• Disable the Embed extension, or restrict its use to trusted users
• Provide your own domain-filtering implementation of EmbedAdapterInterface
• Enable a Content Security Policy (CSP) and outbound firewall restrictions

🚨 CommonMark has DisallowedRawHtml extension bypass via whitespace in HTML tag names

Impact

The DisallowedRawHtml extension can be bypassed by inserting a newline, tab, or other ASCII whitespace character between a disallowed HTML tag name and the closing >. For example, <script\n> would pass through unfiltered and be rendered as a valid HTML tag by browsers. This is a cross-site scripting (XSS) vector for any application that relies on this extension to sanitize untrusted user input.

All applications using the DisallowedRawHtml extension to process untrusted markdown are affected. Applications that use a dedicated HTML sanitizer (such as HTML Purifier) on the rendered output are not affected.

Patches

Fixed in 2.8.1. The regex character class [ \/>] was changed to [\s\/>] to match all whitespace characters that browsers accept as valid tag name terminators.

Workarounds

• Set the html_input configuration option to 'escape' or 'strip' to disable all raw HTML, though this is a broader restriction than the DisallowedRawHtml extension provides.
• Pass the rendered HTML through a dedicated HTML sanitizer before serving it to users (always recommended)

Resources

• CommonMark DisallowedRawHtml documentation
• CWE-79: Improper Neutralization of Input During Web Page Generation
• CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)

Release Notes

2.8.2

This is a security release to address an issue where the allowed_domains setting for the Embed extension can be bypassed, resulting in a possible SSRF and XSS vulnerabilities.

Fixed

• Fixed DomainFilteringAdapter hostname boundary bypass where domains like youtube.com.evil could match an allowlist entry for youtube.com (GHSA-hh8v-hgvp-g3f5)

Full Changelog: 2.8.1...2.8.2

2.8.1

What's Changed

This is a security release to address an issue where DisallowedRawHtml can be bypassed, resulting in a possible cross-site scripting (XSS) vulnerability.

Fixed

• Fixed DisallowedRawHtmlRenderer not blocking raw HTML tags with trailing ASCII whitespace (GHSA-4v6x-c7xx-hw9f)
• Fixed PHP 8.5 deprecation (#1107)

New Contributors

• @Kocal made their first contribution in #1106
• @freost made their first contribution in #1107

Full Changelog: 2.8.0...2.8.1

2.8.0

What's Changed

Added

• Added a new HighlightExtension for marking important text using == syntax (#1100)

Fixed

• Fixed AutolinkExtension incorrectly matching URLs after invalid www. prefix (#1095, #1103)

New Contributors

• @samwilson made their first contribution in #1090
• @ossobuffo made their first contribution in #1100

Full Changelog: 2.7.1...2.8.0

2.7.1

Notable Changes

Changed

• Optimized several regular expressions in RegexHelper to improve performance (#674, #1086)

Fixed

• EmbedProcessor no longer calls updateEmbeds() when there are no embeds to update (#1081)
• Fixed missing benchmark.php CSV path validation for non-existent files (#1068, #1085)

New Contributors

• @driesvints made their first contribution in #1077
• @adielcristo made their first contribution in #1079
• @Copilot made their first contribution in #1085

Full Changelog: 2.7.0...2.7.1

Does any of this look wrong? Please let us know.

Commits

See the full diff on Github. The new version differs by 65 commits:

• Fix DomainFilteringAdapter hostname boundary bypass
• Document dangers of enabling an unsafe php.ini setting
• Almost forgot this entry
• Merge commit from fork
• Prepare to release 2.8.1
• Fix DisallowedRawHtml bypass via newline/tab in tag names
• Add regression test
• Merge pull request #1107 from freost/fix-php85-deprecation-error
• Fix PHP 8.5 deprecation
• Merge pull request #1106 from Kocal/patch-1
• [Docs] Fix "rendering" page rendering
• Merge pull request #1104 from thephpleague/renovate/major-symfony
• Allow any 8.x version
• Update symfony packages to v8
• Bump branch alias
• Prepare to release 2.8.0
• Merge pull request #1103 from thephpleague/copilot/fix-autolink-extension-issue
• Merge remote-tracking branch 'origin/2.7'
• Fix AutolinkExtension to anchor regex and add test cases
• Initial plan
• Merge pull request #1100 from ossobuffo/main
• Fix frontmatter
• Update docs and CHANGELOG
• Merge remote-tracking branch 'origin/main' into ossobuffo-main
• Merge pull request #1102 from thephpleague/simplify-docs
• Fix broken links
• Refactor docs to use major version folders instead of minor versions
• Rename extension to HighlightExtension
• Fix failing tests
• Fix code style violations
• Add Mark (highlight) extension
• Update actions/checkout action to v6 (#1099)
• Merge pull request #1090 from samwilson/patch-1
• Add LatexRenderer to community extensions list
• Update actions/checkout action to v5 (#1089)
• Prepare to release 2.7.1
• Merge pull request #1086 from thephpleague/regex-optimizations
• Optimize HTML Block Type 6 pattern with possessive quantifiers
• Add possessive quantifiers to HTML tag patterns to prevent backtracking
• Optimize PARTIAL_HTMLCOMMENT with better grouping
• Add atomic group to PARTIAL_ENTITY to prevent backtracking
• Optimize REGEX_THEMATIC_BREAK by consolidating anchors
• Optimize REGEX_PUNCTUATION by removing redundant explicit characters
• Merge pull request #1085 from thephpleague/copilot/fix-1068
• Fix benchmark.php CSV path validation for non-existent files
• Exclude CLAUDE.md from exports
• Initial plan
• Fix Docker builds
• Add CLAUDE.md
• Merge pull request #1084 from DanielEScherzer/patch-1
• README: add link to Pygments Highlighter extension
• Merge pull request #1064 from thephpleague/renovate/vimeo-psalm-6.x
• Add <source> section
• Fix non-public data providers
• Update dependency vimeo/psalm to v6
• Merge pull request #1081 from driesvints/patch-2
• wip
• wip
• wip
• Update EmbedProcessor.php
• Merge pull request #1079 from adielcristo/patch-1
• Use absolute link
• Fix license link
• Merge pull request #1077 from driesvints/patch-1
• Update embed.md

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