repomix Vulnerable to Command Injection (RCE) via --remote-branch Argument Injection

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

8.8 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS

• CVE-2026-49987: 0.70% estimated exploitation activity in the next 30 days; percentile 53.14 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Vulnerability Metadata | Field | Detail | | --- | --- | | Affected Component | src/core/git/gitCommand.ts (execGitShallowClone) | | Impact | Arbitrary Command Execution / Security Control Bypass | Summary The --remote-branch CLI option in repomix is vulnerable to argument injection. User-supplied input is passed directly to git fetch and git checkout subprocesses via childprocess.execFileAsync without sanitization, -- delimiters, or validation. An attacker can inject arbitrary git command-line options. By injecting the --upload-pack option and specifying an SSH (git@...) or local (file://) remote URL, an attacker achieves arbitrary command execution with the privileges of the user running repomix. This bypasses the existing dangerousParams blocklist implemented in validateGitUrl(). Vulnerable Code Analysis File: src/core/git/gitCommand.ts The remoteBranch parameter is appended directly to the arguments array for git subprocesses without the -- positional delimiter. Sink 1 (Lines…

Published by the source

1 Jul 2026, 19:00 UTC

Last modified by the source

1 Jul 2026, 19:26 UTC

Source last checked

26 Oct 2026, 12:56 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-9mm9-rqhj-j5mx

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-9mm9-rqhj-j5mx

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# Patch Next advisory brief: CVE-2026-49987

Advisory: repomix Vulnerable to Command Injection (RCE) via `--remote-branch` Argument Injection
IDs: CVE-2026-49987, GHSA-9mm9-rqhj-j5mx
Record: https://patchnext.com/advisories/cve-2026-49987 (revision 2, source checked 26 Oct 2026, 12:56 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.8)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: repomix 1.14.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm repomix: affected < 1.14.1; fixed in 1.14.1

## Suggested inspection (read-only)
- `npm ls repomix --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on repomix.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-9mm9-rqhj-j5mx (OSV record GHSA-9mm9-rqhj-j5mx lists affected ranges: npm repomix >=0 <1.14.1 (fixed))
- Verified: https://github.com/advisories/GHSA-9mm9-rqhj-j5mx (GitHub-reviewed advisory GHSA-9mm9-rqhj-j5mx lists affected ranges: npm repomix >=0 <1.14.1)

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