CVE-2026-35031: Jellyfin is an open source self hosted media server

Q: How do I fix CVE-2026-35031?

jellyfin: upgrade to 10.11.7. Exact commands for each OS are on this page.

Q: Is CVE-2026-35031 being exploited?

CVE-2026-35031 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-35031 affect?

CVE-2026-35031 affects jellyfin. Severity is critical (CVSS 9.9). Jellyfin is an open source self hosted media server. Versions prior to 10.11.7 contain a vulnerability chain in the subtitle upload endpoint (POST /Videos/{itemId}/Subtitles), where the Format field is not validated, allowing path traversal

Q: How urgent is CVE-2026-35031?

Priority 48/100. Critical severity

This month

CRITICAL 9.9UPGRADE

CVE-2026-35031 is a critical-severity flaw (CVSS 9.9) affecting jellyfin. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Jellyfin is an open source self hosted media server. Versions prior to 10.11.7 contain a vulnerability chain in the subtitle upload endpoint (POST /Videos/{itemId}/Subtitles), where the Format field is not validated, allowing path traversal via the file extension and enabling arbitrary file write. This arbitrary file write can be chained into arbitrary file read via .strm files, database extraction, admin privilege escalation, and ultimately remo

Why this priority

Critical severity

A fixed release or distro patch exists.

Risk facts

CVSS score	9.9 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.8% (top 45%)
CISA exploited list	No
Weakness	CWE-20, CWE-22, CWE-187
Published	2026-04-14
Last modified	2026-07-24

Publisher (CNA): GitHub, Inc. · Vendor: jellyfin

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-14 23:16 UTCPublished CVE record published
2026-07-24 21:10 UTCUpdated Record last modified

jellyfin jellyfin UPGRADE

Affected: < 10.11.7

Fixed in: 10.11.7

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 10.11.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade jellyfin

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade jellyfin

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2026-35031?

jellyfin: upgrade to 10.11.7. Exact commands for each OS are on this page.

Is CVE-2026-35031 being exploited?

CVE-2026-35031 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-2026-35031 affect?

CVE-2026-35031 affects jellyfin. Severity is critical (CVSS 9.9). Jellyfin is an open source self hosted media server. Versions prior to 10.11.7 contain a vulnerability chain in the subtitle upload endpoint (POST /Videos/{itemId}/Subtitles), where the Format field is not validated, allowing path traversal

How urgent is CVE-2026-35031?

Priority 48/100. Critical severity

Software pages

Jellyfin vulnerabilities

Related CVEs

CVE-2026-35033 CRITICAL 9.1 UPGRADE Jellyfin is an open source self hosted media server
CVE-2026-35032 HIGH 8.1 UPGRADE Jellyfin is an open source self hosted media server
CVE-2026-35034 MEDIUM 6.5 UPGRADE Jellyfin is an open source self hosted media server

References

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