CVE-2026-10732: decompress Arbitrary File Write Vulnerability

MODERATE
Advisory Identifier: GHSA-h39j-r5qq-r9mm
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CVSS 6.4
CWE-29 CWE-22
Published
Advisory Summary

CVE-2026-10732 is a MODERATE (CVSS 6.4) arbitrary file write vulnerability (CWE-29: Path Traversal: '\..\filename') affecting decompress libraries in the npm ecosystem. The issue involves arbitrary file write via archive extraction (zip slip). Remediation is available in the latest vendor maintenance releases.

CVE-2026-10732 at a Glance

CVE Identifier CVE-2026-10732
GHSA Identifier GHSA-h39j-r5qq-r9mm
Severity MODERATE
CVSS v3.1 Base Score 6.4
CWE Classification CWE-29: Path Traversal: '\..\filename'
Affected Product decompress
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 6.4

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:L).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity High (I:H)
Availability Low (A:L)

How to Fix CVE-2026-10732

To remediate this vulnerability, upgrade all affected decompress dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

decompress fixed: Latest secure release 
npm install decompress@Latest secure release
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls decompress

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-10732, inspect your project dependencies using npm:

npm ls decompress

Analyze the terminal output to locate any version of decompress in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The npm ls decompress command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-29: Path Traversal: '\..\filename', where the product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize '\..\filename' (leading backslash dot dot) sequences that can resolve to a location that is outside of that directory. In decompress, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

All versions of the package decompress are vulnerable to Arbitrary File Write via Archive Extraction (Zip Slip) when extracting a ZIP archive containing two entries with the same path - the first being a symlink to an arbitrary target and the second being a regular file - the file content is written through the symlink to the target location outside the output directory. This is due to the microtask processing order that checks readlink for the second file before resolving symlink for the first file. An attacker can write arbitrary files on the host filesystem potentially leading to remote code execution by providing a specially crafted ZIP archive. **Note:** This bypasses all existing path traversal protections including preventWritingThroughSymlink, added as a part of the fix for [CVE-2020-12265](https://security.snyk.io/vuln/SNYK-JS-DECOMPRESS-557358).

CVE-2026-10732 Affected decompress Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
decompress
npm/decompress
npm
≤ 4.2.1

References

NVD — CVE-2026-10732 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-10732
decompress Source Repository REPOSITORY
https://github.com/kevva/decompress/pull/112
decompress Security Information SECURITY
https://access.redhat.com/security/cve/CVE-2026-10732
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=2485376
decompress Source Repository REPOSITORY
https://gist.github.com/Alemmi/409c3cc148c39522c6d6a8538b0e1f9e
decompress Source Repository REPOSITORY
https://github.com/kevva/decompress
decompress Security Information SECURITY
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-10732.json
decompress Security Information SECURITY
https://security.snyk.io/vuln/SNYK-JS-DECOMPRESS-16415209

Frequently Asked Questions

What is CVE-2026-10732?
CVE-2026-10732 is a security vulnerability in decompress involving Arbitrary File Write via Archive Extraction (Zip Slip) under CWE-29: Path Traversal: '\..\filename'.
Which decompress versions are affected?
Affected versions include releases prior to current release patches across affected packages: decompress.
What version fixes CVE-2026-10732?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is decompress affected?
Yes, decompress is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2026-10732?
CVE-2026-10732 has a CVSS v3.1 base score of 6.4 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:L.
What CWE is associated with CVE-2026-10732?
CVE-2026-10732 is classified under CWE-29: Path Traversal: '\..\filename' (The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize '\..\filename' (leading backslash dot dot) sequences that can resolve to a location that is outside of that directory.).
How can I check npm dependencies for CVE-2026-10732?
Run the dependency tree command: 'npm ls decompress'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-h39j-r5qq-r9mm",
  "modified" : "2026-07-29T15:51:53Z",
  "published" : "2026-06-05T09:33:46Z",
  "aliases" : [ "CVE-2026-10732" ],
  "summary" : "decompress: Arbitrary File Write via Archive Extraction (Zip Slip)",
  "details" : "All versions of the package decompress are vulnerable to Arbitrary File Write via Archive Extraction (Zip Slip) when extracting a ZIP archive containing two entries with the same path - the first being a symlink to an arbitrary target and the second being a regular file - the file content is written through the symlink to the target location outside the output directory. This is due to the microtask processing order that checks readlink for the second file before resolving symlink for the first file. An attacker can write arbitrary files on the host filesystem potentially leading to remote code execution by providing a specially crafted ZIP archive.\n\n**Note:**\n\nThis bypasses all existing path traversal protections including preventWritingThroughSymlink, added as a part of the fix for [CVE-2020-12265](https://security.snyk.io/vuln/SNYK-JS-DECOMPRESS-557358).",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:L"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N/E:P"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "decompress"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "4.2.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-10732"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/kevva/decompress/pull/112"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/security/cve/CVE-2026-10732"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2485376"
  }, {
    "type" : "WEB",
    "url" : "https://gist.github.com/Alemmi/409c3cc148c39522c6d6a8538b0e1f9e"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/kevva/decompress"
  }, {
    "type" : "WEB",
    "url" : "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-10732.json"
  }, {
    "type" : "WEB",
    "url" : "https://security.snyk.io/vuln/SNYK-JS-DECOMPRESS-16415209"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-22", "CWE-29" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-29T15:51:53Z",
    "nvd_published_at" : "2026-06-05T07:16:29Z"
  }
}