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CVE-2026-82455

7.1 · HIGH

RubyGems fails to re-validate path containment after filesystem symlink resolution during gem extraction.

Published Aug 29, 2026CWE-59

Overview

CVE-2026-82455 is a high-severity vulnerability. It was published on August 29, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/ruby/rubygemsGitHubgithub.com/ruby/rubygems/commit/103ca4230deacb31b9fcd813de109e83b5fc71acGitHubgithub.com/ruby/rubygems/pull/9493Refwww.vulncheck.com/advisories/rubygems-before-4.0.13-path-traversal-via-symlink-resolution

How CyberStrike helps

Frequently asked questions

What is CVE-2026-82455?

CVE-2026-82455 is a high-severity vulnerability. It was published on August 29, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-82455?

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-82455?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-82455?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-82455 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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