RubyGems before 4.0.13 Path Traversal via Symlink Resolution (CVE-2026-82455) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-82455

RubyGems before 4.0.13 Path Traversal via Symlink Resolution

Answer in brief

CVE-2026-82455 records a Unknown severity vulnerability in RubyGems before 4.0.13 Path Traversal via Symlink Resolution. The current sources do not mark it as known exploited. The current feed maps ruby/rubygems (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 29, 2026Updated Aug 29, 2026Source checked Aug 29, 2026First seen by HOL Aug 29, 2026Material review Aug 29, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps ruby/rubygems (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
ruby/rubygemsgeneric	>=3.2.30 <4.0.13	4.0.13

Recommended response

Check inventory. Check lockfiles and deployed manifests for ruby/rubygems.
Review the reported fix. Update ruby/rubygems to 4.0.13 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 29, 2026

Sources and claim methodology

Upstream source description

RubyGems fails to re-validate path containment after filesystem symlink resolution during gem extraction. When a pre-existing symlink inside the destination directory points outside the extraction root, extracted files that appear to be written under the destination directory can instead be written outside of it, breaking the extraction safety boundary. The fix resolves the real path of the parent directory before writing and raises Gem::Package::PathError if it escapes the destination directory.

Quoted source text, attributed separately from HOL analysis.