extract-zip unvalidated symlink path traversal

Answer in brief

CVE-2026-56876 records a High severity (CVSS 8.1) vulnerability in extract-zip unvalidated symlink path traversal. The current sources do not mark it as known exploited. The current feed maps extract-zip (npm), extract-zip (npm). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 26, 2026Updated Sep 10, 2026Source checked Sep 10, 2026First seen by HOL Jun 26, 2026Material review Sep 10, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.1
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Not reported

Why this deserves its current priority

CVSS is 8.1. 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 extract-zip (npm), extract-zip (npm). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
extract-zipnpm	<=2.0.1	Not reported
extract-zipnpm	>=0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for extract-zip, extract-zip.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Jun 26, 2026
Evidence: source:ghsa:source_dates:source-dates:record
Source modified
Sep 10, 2026
Evidence: source:ghsa:source_dates:source-dates:record
First seen by HOL
Jun 26, 2026

Sources and claim methodology

Upstream source description

extract-zip does not validate symlink targets when extracting zip archives. When processing a malicious zip file containing a symlink with a relative path like '../../../../etc/passwd', extract-zip will extract the symlink without validation, allowing it to point outside the extraction directory. Depending on how extract-zip is used, an attacker could read or write to arbitrary files.

Quoted source text, attributed separately from HOL analysis.