rubyzip before 3.4.0 Path Traversal in Zip::Entry#extract via Sibling-Directory Prefix (CVE-2026-85396) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-85396

rubyzip before 3.4.0 Path Traversal in Zip::Entry#extract via Sibling-Directory Prefix

Answer in brief

CVE-2026-85396 records a Unknown severity vulnerability in rubyzip before 3.4.0 Path Traversal in Zip::Entry#extract via Sibling-Directory Prefix. The current sources do not mark it as known exploited. The current feed maps rubyzip/rubyzip (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 Sep 3, 2026Updated Sep 3, 2026Source checked Sep 3, 2026First seen by HOL Sep 3, 2026Material review Sep 3, 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 rubyzip/rubyzip (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
rubyzip/rubyzipgeneric	>=0 <3.4.0	3.4.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for rubyzip/rubyzip.
Review the reported fix. Update rubyzip/rubyzip to 3.4.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 3, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 3, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 3, 2026

Sources and claim methodology

Upstream source description

rubyzip versions before 3.4.0 contain a path traversal vulnerability in Zip::Entry#extract that fails to properly validate extraction paths using prefix comparison without trailing separators. Attackers can craft archive entries with names like ../upload_backup/owned.sh to write files outside the intended extraction directory into sibling paths sharing the destination prefix.

Quoted source text, attributed separately from HOL analysis.