CVE-2026-30121: Remotion Arbitrary File Write Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-g6pc-6676-c23j
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CVSS 9.1
CWE-123
Published
Advisory Summary

CVE-2026-30121 is a CRITICAL (CVSS 9.1) arbitrary file write vulnerability vulnerability (CWE-123: Write-what-where Condition) affecting Remotion libraries in the npm ecosystem. The issue involves arbitrary file write vulnerability. Remediation is available by upgrading affected packages to version 4.0.410.

CVE-2026-30121 at a Glance

CVE Identifier CVE-2026-30121
GHSA Identifier GHSA-g6pc-6676-c23j
Severity CRITICAL
CVSS v3.1 Base Score 9.1
CWE Classification CWE-123: Write-what-where Condition
Affected Product Remotion
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 9.1

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

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

How to Fix CVE-2026-30121

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

remotion fixed: 4.0.410 
npm install remotion@4.0.410
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 remotion

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-30121, inspect your project dependencies using npm:

npm ls remotion

Analyze the terminal output to locate any version of Remotion in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.0.410), your application is affected.

Note: The npm ls remotion 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-123: Write-what-where Condition, where any condition where the attacker has the ability to write an arbitrary value to an arbitrary location, often as the result of a buffer overflow. In Remotion, 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

remotion-dev remotion v4.0.409 was discovered to contain an arbitrary file write vulnerability.

CVE-2026-30121 Affected Remotion Versions

1 component(s)
Fixed Versions:
4.0.410
Product / Package Ecosystem Affected Versions Fixed Version
remotion
npm/remotion
npm
< 4.0.410
4.0.410

References

NVD — CVE-2026-30121 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-30121
Remotion Source Repository REPOSITORY
https://github.com/remotion-dev/remotion/pull/6378
Remotion Source Repository REPOSITORY
https://github.com/EaEa0001/security-advisories/blob/main/CVE-2026-30121.md
Remotion Source Repository REPOSITORY
https://github.com/remotion-dev/remotion
Remotion Release RELEASE
https://github.com/remotion-dev/remotion/releases/tag/v4.0.410

Frequently Asked Questions

What is CVE-2026-30121?
CVE-2026-30121 is a security vulnerability in Remotion involving arbitrary file write vulnerability under CWE-123: Write-what-where Condition.
Which Remotion versions are affected?
Affected versions include releases prior to 4.0.410 across affected packages: remotion.
What version fixes CVE-2026-30121?
Upgrading to 4.0.410 (or the latest patched release for your respective branch) resolves the vulnerability.
Is remotion affected?
Yes, remotion is affected in releases prior to 4.0.410. Upgrade your dependency to 4.0.410 or later.
What is the CVSS score of CVE-2026-30121?
CVE-2026-30121 has a CVSS v3.1 base score of 9.1 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.
What CWE is associated with CVE-2026-30121?
CVE-2026-30121 is classified under CWE-123: Write-what-where Condition (Any condition where the attacker has the ability to write an arbitrary value to an arbitrary location, often as the result of a buffer overflow.).
How can I check npm dependencies for CVE-2026-30121?
Run the dependency tree command: 'npm ls remotion'. 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-g6pc-6676-c23j",
  "modified" : "2026-06-19T20:47:59Z",
  "published" : "2026-06-15T21:30:38Z",
  "aliases" : [ "CVE-2026-30121" ],
  "summary" : "Remotion: arbitrary file write vulnerability",
  "details" : "remotion-dev remotion v4.0.409 was discovered to contain an arbitrary file write vulnerability.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "remotion"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.0.410"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-30121"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/remotion-dev/remotion/pull/6378"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/EaEa0001/security-advisories/blob/main/CVE-2026-30121.md"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/remotion-dev/remotion"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/remotion-dev/remotion/releases/tag/v4.0.410"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-123" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-19T20:47:59Z",
    "nvd_published_at" : "2026-06-15T20:16:25Z"
  }
}