Security Digest · Vulnerability record
CVE-2026-30121: Remotion: arbitrary file write vulnerability
remotion-dev remotion v4.0.409 was discovered to contain an arbitrary file write vulnerability.
CVSS 9.1 Critical EPSS 0.5% · p40
Should you act?
Critical and remotely reachable
No known exploitation yet, but it is network-reachable without credentials. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- 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 0.5%, percentile 40: FIRST’s model estimates a 0.5% chance of exploitation activity in the next 30 days, higher than 40% 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
remotion(npm) < 4.0.410, fixed in 4.0.410. Check your lockfile, including transitive dependencies.
What it is
remotion-dev remotion v4.0.409 was discovered to contain an arbitrary file write vulnerability.
From the GitHub advisory
remotion-dev remotion v4.0.409 was discovered to contain an arbitrary file write vulnerability.
Weakness type: CWE-123.
Product: remotion (npm) · Assigned by: mitre · Published: 2026-06-15
Affected and fixed versions
| Ecosystem | Package | Vulnerable | First fixed |
|---|---|---|---|
| npm | remotion | < 4.0.410 | 4.0.410 |
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| n/a | n/a | see vendor advisory |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADP | 3.1 | 9.1 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H |
| GitHub | 3.1 | 9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Privileges required: none (no login)
- User interaction: none
- Scope: unchanged
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none, automatable yes, technical impact total.
- FIRST EPSS (model of 2026-10-21): 0.48% probability of exploitation activity in the next 30 days; percentile 40.
Timeline
- — CVE record published by mitre
- — GitHub-reviewed advisory GHSA-g6pc-6676-c23j published (critical)
- — CVE record last updated
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vulnerability records
- GitHub Advisory GHSA-g6pc-6676-c23j github.com
- CVE.org record CVE-2026-30121 cve.org
- NVD entry CVE-2026-30121 nvd.nist.gov
Other references from the CVE record and advisory
- github.com github.com
- github.com github.com
- github.com github.com