CVE-2026-96656

Plex Media Server arbitrary file write

Plex Media Server before 1.43.3.10861 allows an admin user to write arbitrary files that may be executed on load. The preference TranscoderH264Options is appended verbatim to x264's option string on every transcode. At startup, all .so files are run without signature, execute bit, or symbol checks.

Affected

Plex · Media Server

CVSS v4.0 CNA

8.6 HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 CNA

7.2 HIGHCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS

0.40% chance of exploitation in the next 30 days, 32nd percentile

Published

2026-09-23

Proof-of-concept exploits (1)

• BoredHackerBlog/plex2shell_pcap0★ · 2026-10-17

Security advisories

• https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-266…
• https://www.cve.org/CVERecord?id=CVE-2026-96656
• https://zmain.info/blog/plex2shell
• https://forums.plex.tv/t/plex-media-server/30447/711

References

• CVE Record
• NVD entry

Related

• CVE-2023-38831
• CVE-2026-34908
• CVE-2026-34909
• CVE-2026-34910
• CVE-2026-63077
• CVE-2026-96652