Q: Who is affected? (Versions/Components)

📦 **Affected**: **Jellyfin** (Open Source Media System). 📉 **Versions**: All versions **prior to 10.11.7**. 🏢 **Vendor**: Jellyfin Project. If you are running an older version, you are exposed. 🚩

Q: Is there a public Exp? (PoC/Wild Exploitation)

💣 **Public Exploit**: **No**. 📝 **Status**: The `pocs` field is empty. No public Proof-of-Concept (PoC) or wild exploitation code is currently available. However, the vulnerability is well-understood. 🕵️♂️

Q: Is it fixed officially? (Patch/Mitigation)

🩹 **Fix**: **Yes**. 🚀 **Patch**: Upgrade to **Jellyfin 10.11.7** or later. 🔗 **Reference**: See the GitHub Security Advisory (GHSA-j2hf-x4q5-47j3) for official details. Do not delay! ⏳

Question 1

What is this vulnerability? (Essence + Consequences)

Accepted Answer

🚨 **Essence**: Jellyfin < 10.11.7 has a critical flaw in the subtitle upload endpoint. The `Format` field is not validated.
💀 **Consequences**: This allows **Path Traversal** and **Arbitrary File Write**.…

Question 2

Root Cause? (CWE/Flaw)

Accepted Answer

🛡️ **Root Cause**: **CWE-20** (Improper Input Validation).
🔍 **Flaw**: The application fails to sanitize or verify the `Format` parameter during subtitle uploads.…

Question 3

Who is affected? (Versions/Components)

Accepted Answer

📦 **Affected**: **Jellyfin** (Open Source Media System).
📉 **Versions**: All versions **prior to 10.11.7**.
🏢 **Vendor**: Jellyfin Project. If you are running an older version, you are exposed. 🚩

Question 4

What can hackers do? (Privileges/Data)

Accepted Answer

💻 **Attacker Actions**: Hackers can write arbitrary files to the server filesystem.
🔓 **Privileges**: This leads to **Remote Code Execution (RCE)**.
📊 **Impact**: High.…

Question 5

Is exploitation threshold high? (Auth/Config)

Accepted Answer

🔑 **Threshold**: **Medium**.
🔒 **Auth Required**: **Yes**. The vector indicates `PR:L` (Privileges Required: Low). You need a valid user account to upload subtitles.
🌐 **Network**: Remote (AV:N).…

Question 6

Is there a public Exp? (PoC/Wild Exploitation)

Accepted Answer

💣 **Public Exploit**: **No**.
📝 **Status**: The `pocs` field is empty. No public Proof-of-Concept (PoC) or wild exploitation code is currently available. However, the vulnerability is well-understood. 🕵️‍♂️

Question 7

How to self-check? (Features/Scanning)

Accepted Answer

🔍 **Self-Check**:
1. Check your Jellyfin version in the Admin Dashboard.
2. If version < **10.11.7**, you are vulnerable.
3.…

Question 8

Is it fixed officially? (Patch/Mitigation)

Accepted Answer

🩹 **Fix**: **Yes**.
🚀 **Patch**: Upgrade to **Jellyfin 10.11.7** or later.
🔗 **Reference**: See the GitHub Security Advisory (GHSA-j2hf-x4q5-47j3) for official details. Do not delay! ⏳

Question 9

What if no patch? (Workaround)

Accepted Answer

🛡️ **Workaround (If no patch)**:
1. **Restrict Access**: Limit subtitle upload capabilities to trusted users only.
2. **WAF Rules**: Block requests with suspicious patterns in the `Format` parameter.
3.…

Question 10

Is it urgent? (Priority Suggestion)

Accepted Answer

🚨 **Urgency**: **HIGH**.
🔥 **Priority**: **Immediate Action Required**.
📉 **Reason**: CVSS is Critical (10.0 equivalent impact). RCE is possible with low privileges. Patch immediately to prevent server takeover.…

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CVE-2026-35031 — AI Deep Analysis Summary

Q1What is this vulnerability? (Essence + Consequences)

Q2Root Cause? (CWE/Flaw)

Q3Who is affected? (Versions/Components)

Q4What can hackers do? (Privileges/Data)

Q5Is exploitation threshold high? (Auth/Config)

Q6Is there a public Exp? (PoC/Wild Exploitation)

Q7How to self-check? (Features/Scanning)

Q8Is it fixed officially? (Patch/Mitigation)

Q9What if no patch? (Workaround)

Q10Is it urgent? (Priority Suggestion)

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