VulnSocial

CVE-2026-35033Disclosure(jellyfin / jellyfin)

LOWCVSS 9.1 · CRITICAL

Exploit discussion active in current signal (1 latest mentions)

Immediate actions

  • Hunt for exploitation attempts and persistence artifacts
  • Increase monitoring for publicly documented tradecraft
  • Track advisory updates for patch or workaround availability

Recommended action window: High priority (within 72h)

NVD description

Jellyfin is an open source self hosted media server. Versions prior to 10.11.7 contain an unauthenticated arbitrary file read vulnerability via ffmpeg argument injection through the StreamOptions query parameter parsing mechanism. The ParseStreamOptions method in StreamingHelpers.cs adds any lowercase query parameter to a dictionary without validation, bypassing the RegularExpression attribute on the level controller parameter, and the unsanitized value is concatenated directly into the ffmpeg command line. By injecting a drawtext filter with a textfile argument, an attacker can read arbitrary server files such as /etc/shadow and exfiltrate their contents as text rendered in the video stream response. The vulnerable /Videos/{itemId}/stream endpoint has no Authorize attribute, making this exploitable without authentication, though item GUIDs are pseudorandom and require an authenticated user to obtain. This issue has been fixed in version 10.11.7.

jellyfin CVEsBack to dashboard
1.5/ 10 priority

Sources & remediation

Vendor / third-party advisories
Other references
Weakness type (CWE)
CWE-88CWE-862

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

NONE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • jellyfin

Threat summary

  • Public PoC is present in monitored signal
  • 3 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • PoC mentioned or linked in 1 signal
  • Technical details provided in 3 signals
  • Disclosure: 2 classified signals
  • Peaked 1d ago at 2 mentions (2026-04-15); latest day: 1
  • 3 total mentions across 2 days

Affected systems

Vendors
jellyfin
Products
jellyfin

Deep dive

Activity timeline3 mentions / 2d
01122Mentions · 2026-04-15: 2Mentions · 2026-08-04: 1PoC Mentioned / Linked · 2026-08-04: 1Technical Details · 2026-04-15: 2Technical Details · 2026-08-04: 104-1508-04
Signal classification2 categories
Disclosure
266.7%
PoC
133.3%
Referenced assets6 URLs
Classification over time
DateTotalLabels
2026-04-152
Disclosure2
2026-08-041
PoC1
Full discourse3 posts
  • Mr. OS@ksg93rd
    PoC

    #AppSec 1⃣ Jellyfin RCE (CVE-2026-35033) https://www.sonarsource.com/blog/jellyfin-remote-code-execution 2⃣ Exploiting Langflow's validate_code() Endpoint for RCE (CVE-2026-0770) https://www.resecurity.com/blog/article/exploiting-langflows-validatecode-endpoint-for-remote-code-execution 3⃣ Cruising for Shells in Flowise: 6 RCEs https://www.elttam.com/blog/cruising-for-shells-in-flowise 4⃣ Check Point SmartConsole Authentication Bypass Technical Analysis (CVE-2026-16232) https://www.rapid7.com/blog/post/ra-check-point-smartconsole-authentication-bypass-technical-analysis-cve-2026-16232

    Post summary

    The post lists recent CVE disclosures (mostly RCEs) and links to blog posts offering proof‑of‑concept demonstrations, but does not mention active exploitation, patches, or debunking.

    00001209
    3.3K followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-35033 Jellyfin is an open source self hosted media server. Versions prior to 10.11.7 contain an unauthenticated arbitrary file read vulnerability via ffmpeg argument inject… https://www.cve.org/CVERecord?id=CVE-2026-35033

    Post summary

    The post discloses an unauthenticated arbitrary file read vulnerability in Jellyfin versions before 10.11.7 caused by ffmpeg argument injection, with no mention of exploitation or remediation.

    0000095
    57.2K followersView on X
  • Vulmon Vulnerability Feed@VulmonFeeds
    Disclosure

    CVE-2026-35033 Unauthenticated Arbitrary File Read in Jellyfin via FFmpeg Argument Injection https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-35033

    Post summary

    The text announces a new Jellyfin vulnerability (CVE-2026-35033) that allows unauthenticated arbitrary file reads via FFmpeg argument injection.

    0000053
    4.0K followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Appjellyfinjellyfin---

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