CVE-2026-82455

RubyGems before 4.0.13 Path Traversal via Symlink Resolution

CVE-2026-82455 is fixed in rubygems on 1 platform by DEBIAN-CVE-2026-82455 (version 4.0.15-2), released September 10, 2026. It is not reported as exploited. Patch Radar priority: High.

High
CVSS
7.1
Moderate
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
n/a

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.

Where it's fixed

ProductFixed inFixReleased
Linux
rubygems · Debian 14 4.0.15-2 DEBIAN-CVE-2026-82455 Sep 10, 2026

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