# CVE-2020-26245: systeminformation prototype pollution command injection

Source: https://junglewise.ai/threats/cve-2020-26245-systeminformation-prototype-pollution-command-injection  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2020-11-27. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2020-26245 · Severity: low · CVSS 3.1 · Published 2020-11-27

systeminformation is a Node.js library that retrieves detailed system and OS information. A prototype pollution vulnerability in the si.inetChecksite() function allows attackers to inject arbitrary commands through unsanitized service parameter strings, potentially leading to remote command execution on systems using the library.

Technologies: [systeminformation (npm)](https://junglewise.ai/threats/technologies/systeminformation). Vendors: [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2020-26245 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2020-26245 being exploited in the wild.

**How severe is CVE-2020-26245?** Low severity, with a CVSS score of 3.1, published 27 November 2020.

**Which products and versions are affected?** systeminformation (npm) SEMVER:introduced=0,fixed=4.30.5.

**Is there a fix for CVE-2020-26245?** Yes. systeminformation (npm): upgrade to 4.30.5 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2020-26245 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2020-26245?** Check whether you run systeminformation (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- systeminformation (npm): upgrade to 4.30.5 or later

  ```sh
  npm install systeminformation@4.30.5
  ```


## Technical details

The vulnerability is a command injection flaw introduced via prototype pollution in the systeminformation library. The root cause is insufficient shell sanitization in the si.inetChecksite() function, which accepts service parameter strings that are not properly validated before being used in shell command execution. An attacker can exploit this by crafting malicious service parameter strings containing shell metacharacters or command injection payloads, bypassing the intended parameter handling through prototype pollution techniques. This allows remote code execution on the affected system. The fix involves a rewrite of shell sanitation logic to prevent prototype pollution. All versions prior to 4.30.5 are affected; users should upgrade immediately or sanitize service parameter inputs as a workaround.

## Affected products

- sebhildebrandt systeminformation < 4.30.5

## Identifiers

- CVE-2020-26245
- GHSA-4v2w-h9jm-mqjg

## Timeline

- 2020-11-27: disclosed: Advisory published
- 2020-11-26: patched: Fix released in version 4.30.5

## References

- [https://github.com/sebhildebrandt/systeminformation/security/advisories/GHSA-4v2w-h9jm-mqjg](https://github.com/sebhildebrandt/systeminformation/security/advisories/GHSA-4v2w-h9jm-mqjg)
- [https://github.com/sebhildebrandt/systeminformation/commit/8113ff0e87b2f422a5756c48f1057575e73af016](https://github.com/sebhildebrandt/systeminformation/commit/8113ff0e87b2f422a5756c48f1057575e73af016)

## Related threats

- [systeminformation prototype pollution in networkStats](https://junglewise.ai/threats/cve-2026-116674-systeminformation-is-a-system-and-os-information-library-for)
- [systeminformation has path traversal in Linux networkStats() that allows symlink-based file disclosure outside /sys/class/net](https://junglewise.ai/threats/cve-2026-116673-systeminformation-is-a-system-and-os-information-library-for)
- [systeminformation PowerShell command injection via Unicode quotation marks](https://junglewise.ai/threats/cve-2026-116576-systeminformation-is-a-system-and-os-information-library-for)
- [sebhildebrandt systeminformation OS command injection in networkInterfaces](https://junglewise.ai/threats/cve-2026-50289-sebhildebrandt-systeminformation-os-command-injection-in)
- [sebhildebrandt systeminformation command injection in networkInterfaces](https://junglewise.ai/threats/cve-2026-44724-sebhildebrandt-systeminformation-command-injection-in)