Live › vulnerability › CVE-2026-96656
Go to dashboardAn admin user of Plex Media Server can set the TranscoderH264Options preference, which is appended verbatim to x264's options on every transcode, to write arbitrary files. At startup all .so files in the Codecs folder are loaded without signature, execute-bit or symbol checks, so a written file runs as code. CISA lists it as exploited, chained with CVE-2026-96652, -96654 and -96655.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 5h before NVD. All times on this page are UTC.
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| Plex Media Server | vendor | < 1.43.3.10861 | 1.43.3.10861 |
| Plex Media Server | vendor | – | – |
1.43.3.10861 is affected (compare all four numbers)1.43.3.10861 or laterEach row is the first time that source carried this signal. The analyst’s rows are its own findings.
@_master11717k followers · X“@JackRockHardest It's been so rough. My NAS even got compromised by plex2shell. Cleanup was hell”
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Plex Media Server contains an external control of file name or path vulnerability which can allow an admin user to write arbitrary files that may be executed on load. This vulnerability can be chained with CVE-2026-96652, CVE-2026-96654, and CVE-2026-96655.
CISA required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
This page as .md · .json · in your agent: get_signal("CVE-2026-96656")
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