jekyll-4.3.4.gem: 2 vulnerabilities (highest severity is: 7.5)

[mend-bolt-for-github]

Vulnerable Library - jekyll-4.3.4.gem

Path to dependency file: /Gemfile.lock

Path to vulnerable library: /Gemfile.lock

Vulnerabilities

Vulnerability	Severity	CVSS	Dependency	Type	Fixed in (jekyll version)	Remediation Possible**
CVE-2026-35611	High	7.5	addressable-2.8.7.gem	Transitive	N/A*	❌
CVE-2025-58767	Medium	4.0	rexml-3.4.0.gem	Transitive	N/A*	❌

*For some transitive vulnerabilities, there is no version of direct dependency with a fix. Check the "Details" section below to see if there is a version of transitive dependency where vulnerability is fixed.

**In some cases, Remediation PR cannot be created automatically for a vulnerability despite the availability of remediation

Details

CVE-2026-35611

Vulnerable Library - addressable-2.8.7.gem

Addressable is an alternative implementation to the URI implementation that is part of Ruby's standard library. It is flexible, offers heuristic parsing, and additionally provides extensive support for IRIs and URI templates.

Library home page: https://rubygems.org/gems/addressable-2.8.7.gem

Path to dependency file: /Gemfile.lock

Path to vulnerable library: /Gemfile.lock

Dependency Hierarchy:

• jekyll-4.3.4.gem (Root Library)
  • ❌ addressable-2.8.7.gem (Vulnerable Library)

Found in base branch: source

Vulnerability Details

Addressable is an alternative implementation to the URI implementation that is part of Ruby's standard library. From 2.3.0 to before 2.9.0, within the URI template implementation in Addressable, two classes of URI template generate regular expressions vulnerable to catastrophic backtracking. Templates using the * (explode) modifier with any expansion operator (e.g., {foo*}, {+var*}, {#var*}, {/var*}, {.var*}, {;var*}, {?var*}, {&var*}) generate patterns with nested unbounded quantifiers that are O(2^n) when matched against a maliciously crafted URI. Templates using multiple variables with the + or # operators (e.g., {+v1,v2,v3}) generate patterns with O(n^k) complexity due to the comma separator being within the matched character class, causing ambiguous backtracking across k variables. When matched against a maliciously crafted URI, this can result in catastrophic backtracking and uncontrolled resource consumption, leading to denial of service. This vulnerability is fixed in 2.9.0.

Publish Date: 2026-04-07

URL: CVE-2026-35611

CVSS 3 Score Details (7.5)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: None
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: None
  • Integrity Impact: None
  • Availability Impact: High

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Release Date: 2026-04-07

Fix Resolution: https://github.com/sporkmonger/addressable.git - addressable-2.9.0

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CVE-2025-58767

Vulnerable Library - rexml-3.4.0.gem

An XML toolkit for Ruby

Library home page: https://rubygems.org/gems/rexml-3.4.0.gem

Path to dependency file: /Gemfile.lock

Path to vulnerable library: /Gemfile.lock

Dependency Hierarchy:

• jekyll-4.3.4.gem (Root Library)
  • kramdown-parser-gfm-1.1.0.gem
    • kramdown-2.5.1.gem
      • ❌ rexml-3.4.0.gem (Vulnerable Library)

Found in base branch: source

Vulnerability Details

REXML is an XML toolkit for Ruby. The REXML gems from 3.3.3 to 3.4.1 has a DoS vulnerability when parsing XML containing multiple XML declarations. If you need to parse untrusted XMLs, you may be impacted to these vulnerabilities. The REXML gem 3.4.2 or later include the patches to fix these vulnerabilities.

Publish Date: 2025-09-17

URL: CVE-2025-58767

CVSS 3 Score Details (4.0)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Local
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: None
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: None
  • Integrity Impact: None
  • Availability Impact: Low

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: GHSA-c2f4-jgmc-q2r5

Release Date: 2025-09-17

Fix Resolution: rexml - 3.4.2,https://github.com/ruby/rexml.git - v3.4.2

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[mend-bolt-for-github]

✔️ This issue was automatically closed by Mend because the vulnerable library in the specific branch(es) was either marked as ignored or it is no longer part of the Mend inventory.

[mend-bolt-for-github]

ℹ️ This issue was automatically re-opened by Mend because the vulnerable library in the specific branch(es) has been detected in the Mend inventory.