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.

Attack Vector Local

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction Passive

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact High

Availability Impact High

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
ruby rubygems unaffected
Version Status Constraints
3.2.30 affected < 4.0.13

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Project Subscriptions

Vendors Products
Rubygems Subscribe
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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/ruby/rubygems cve-icon cve-icon
https://github.com/ruby/rubygems/commit/103ca4230deacb31b9fcd813de109e83b5fc71ac cve-icon cve-icon
https://github.com/ruby/rubygems/pull/9493 cve-icon cve-icon
https://www.vulncheck.com/advisories/rubygems-before-4.0.13-path-traversal-via-symlink-resolution cve-icon cve-icon
History

Sat, 29 Aug 2026 14:00:00 +0000

Type Values Removed Values Added
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.
Title RubyGems before 4.0.13 Path Traversal via Symlink Resolution
First Time appeared Rubygems
Rubygems rubygems
Weaknesses CWE-59
CPEs cpe:2.3:a:rubygems:rubygems:*:*:*:*:*:*:*:*
Vendors & Products Rubygems
Rubygems rubygems
References
Metrics cvssV3_1

{'score': 7.1, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H'}

cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-29T13:47:56.760Z

Reserved: 2026-08-29T13:22:59.614Z

Link: CVE-2026-82455

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-29T14:16:38.623

Modified: 2026-08-29T14:16:38.623

Link: CVE-2026-82455

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-29T15:30:05Z

Weaknesses