---
title: "CVE-2026-102828: simple-git unsafe-operation guard does not block trailer command configuration"
url: https://erroneo.us/security/cve/CVE-2026-102828/
description: "CVE-2026-102828 (simple-git (npm)): simple-git, an interface for running git commands in any node.js application, enables applications to execute Git…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-09-29
date_modified: 2026-10-05
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-102828"
kev: false
cvss: 9.2
epss: 0.00375
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-102828: simple-git unsafe-operation guard does not block trailer command configuration

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.4% , percentile 30: FIRST’s model estimates a 0.4% chance of exploitation activity in the next 30 days, higher than 30% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes simple-git (npm) >= 3.15.0, < 4.0.1, fixed in 4.0.1 . Check your lockfile, including transitive dependencies.

## What it is

simple-git, an interface for running git commands in any node.js application, enables applications to execute Git operations from JavaScript. From 3.15.0 until 4.0.1, the default blockUnsafeOperationsPlugin does not classify trailer. .cmd as unsafe configuration. An application that passes attacker-controlled values through SimpleGitOptions.config or inline -c arguments can therefore allow Git to invoke an attacker-selected shell command when git interpret-trailers processes the configured trailer. The command executes with the operating-system identity and permissions of the Node.js process. This issue is fixed in 4.0.1.

## Affected packages

- npm `simple-git` >= 3.15.0, < 4.0.1 → fixed: 4.0.1

## Affected products (CVE record)

- steveukx git-js: >= 3.15.0, < 4.0.1

## Severity

- GitHub_M CVSS 4.0: 9.2 `CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`
- GitHub CVSS 4.0: 9.2 `CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.38% probability of exploitation activity in the next 30 days; percentile 30.

## Sources

- [GitHub Advisory GHSA-x6jw-m9v5-85vh](https://github.com/advisories/GHSA-x6jw-m9v5-85vh)
- [CVE.org record CVE-2026-102828](https://www.cve.org/CVERecord?id=CVE-2026-102828)
- [NVD entry CVE-2026-102828](https://nvd.nist.gov/vuln/detail/CVE-2026-102828)
- [github.com](https://github.com/steveukx/git-js/security/advisories/GHSA-x6jw-m9v5-85vh)
- [github.com](https://github.com/steveukx/git-js/pull/1198)
- [github.com](https://github.com/steveukx/git-js/commit/d762810c13b331ff1e5eb24c0b434646d2a8d1b3)
- [github.com](https://github.com/steveukx/git-js/releases/tag/simple-git@4.0.1)

---
Source page: https://erroneo.us/security/cve/CVE-2026-102828/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt