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CVE-2026-101894 — Vulnerability in @xhmikosr/decompress — CVE Details

CRITICAL

@xhmikosr/decompress: Path traversal via symlink chain

Published September 29, 2026Updated September 30, 2026Source: osv

Summary

### Impact When extracting an untrusted archive with the default `decompress(input, output)` API, a crafted archive containing a chain of symlink entries can make a later entry resolve **outside** the output directory. The lexical containment checks pass, but the kernel follows the planted symlinks to a path outside `output`, letting an attacker write (and read) files outside the intended extraction directory. Overwriting startup scripts or configuration can lead to remote code execution. This is a bypass of the hardening in GHSA-mp2f-45pm-3cg9. Any application that extracts attacker-controlled archives is affected. ### Patches Fixed in **11.1.4** (`latest`) and backported to **10.2.2** (`release-v10` dist-tag). Upgrade to one of these. The unmaintained upstream `decompress` package shares this flaw and will not be patched. Migrate to `@xhmikosr/decompress@11.1.4` (or `@10.2.2`). ### Workarounds None. Do not extract untrusted archives on affected versions. If you cannot upgrade, validate entries out of band and reject any whose resolved path escapes the target directory.

Advisory Timeline

  • First published September 29, 2026 (12 days ago).
  • Last revised September 30, 2026 — 0 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

npm
Update @xhmikosr/decompress to 10.2.2 or later
npm install @xhmikosr/decompress@10.2.2
npm
Update @xhmikosr/decompress to 11.1.4 or later
npm install @xhmikosr/decompress@11.1.4

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (3)

Affects 1 ecosystem: npm (2).

PackageEcosystemAffectedFixed In
@xhmikosr/decompress
npm
All versions10.2.2
@xhmikosr/decompress
npm
All versions11.1.4
decompress
npm
All versionsRange-based data available

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.1 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References

Frequently Asked Questions

What is CVE-2026-101894?
@xhmikosr/decompress: Path traversal via symlink chain This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.1/10).
How do I check if my project is affected by CVE-2026-101894?
CVE-2026-101894 affects @xhmikosr/decompress and decompress. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-101894 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.1

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-hrh2-vp3x-79xf

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