CVE-2026-82455

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.

References

https://www.vulncheck.com/advisories/rubygems-before-4.0.13-path-traversal-via-symlink-resolution

https://github.com/ruby/rubygems/pull/9493

https://github.com/ruby/rubygems/commit/103ca4230deacb31b9fcd813de109e83b5fc71ac

https://github.com/ruby/rubygems

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4