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Vulnerability · Published Sep 28, 2026 · Assigned by GitHub_M

CVE-2026-101894@xhmikosr/decompress: Path traversal via symlink chain

Critical 9.1

In plain English

A critical-severity path traversal in decompress from kevva. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 57% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.1Critical
Exploit odds (30 days)0.8%top 42.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC

Official description

The decompress package for Node.js extracts archives. Prior to 10.2.2 and 11.1.4, the default decompress(input, output) API relies on lexical containment checks that do not account for the kernel following a planted symlink chain. An attacker can supply a crafted archive containing chained symlink entries so that a later entry resolves outside the output directory. This allows files outside output to be read or written, and overwriting startup scripts or configuration can lead to remote code execution. The maintained @xhmikosr/decompress package is fixed in 10.2.2 and 11.1.4, but the separately affected unmaintained decompress package remains unpatched through 4.2.1. This vulnerability results from a bypass of the incomplete hardening for CVE-2026-53486. @xhmikosr/decompress is fixed in versions 10.2.2 and 11.1.4.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
npm@xhmikosr/decompress11.1.4GHSA-hrh2-vp3x-79xf
npm@xhmikosr/decompress10.2.2GHSA-hrh2-vp3x-79xf
npmdecompressno fix listedGHSA-hrh2-vp3x-79xf

Affected products (as reported)

VendorProductVersions
XhmikosR decompress < 10.2.2>= 11.0.0, < 11.1.4
kevva decompress <= 4.2.1

Weakness: CWE-22, CWE-59 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References