CVE-2026-30121: remotion-dev remotion v4.0.409 was discovered to contain an arbitrary file write vulnerability.

This month

CRITICAL 9.1REMOTEDOWNGRADE

CVE-2026-30121 is a critical-severity flaw (CVSS 9.1) affecting remotion. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 75%)
CISA exploited list	No
Weakness	CWE-123
Published	2026-06-15
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: remotion

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-15 20:16 UTCPublished CVE record published
2026-06-17 16:10 UTCUpdated Record last modified

remotion remotion DOWNGRADE

Affected: 4.0.409

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0.409

1. Check installed version

apt-cache policy remotion || rpm -q remotion || remotion --version

2. No fixed release: DOWNGRADE to a release before 4.0.409 (Debian / Ubuntu)

apt-cache madison remotion sudo apt install remotion=<VERSION_BEFORE_4.0.409> sudo apt-mark hold remotion

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list remotion sudo dnf downgrade remotion-<VERSION_BEFORE_4.0.409> sudo dnf versionlock add remotion

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-30121?

remotion: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-30121 being exploited?

CVE-2026-30121 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-30121 affect?

CVE-2026-30121 affects remotion. Severity is critical (CVSS 9.1). remotion-dev remotion v4.0.409 was discovered to contain an arbitrary file write vulnerability.

How urgent is CVE-2026-30121?

Priority 43/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-30120 CRITICAL 9.8 DOWNGRADE remotion-dev remotion v4.0.409 was discovered to contain a remote code execution (RCE) vulnerability.

References

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