CVE-2026-96656

Exploitation active confirmée

Ajoutée au catalogue CISA KEV le 20/10/2026, correctif exigé avant le 23/10/2026 pour les agences fédérales américaines.

Action requise : 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.

Description officielle (NVD)

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.

Preuves de concept publiques (1)

Dépôts tiers non vérifiés, parfois piégés. Ne les exécutez jamais en production : uniquement dans un environnement de test isolé.

• a3igner/plex-codec-cache-implant · ★ 0 · 18/10/2026
  Incident write-up: unsigned .so in the Plex Media Server codec cache executes a dropper on every transcode (CVE-2026-96656) — IOCs, STIX, YARA

Références

• https://forums.plex.tv/t/plex-media-server/30447/711 , Release Notes
• https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-266-01.json , Third Party Advisory
• https://www.cve.org/CVERecord?id=CVE-2026-96656 , Third Party Advisory, VDB Entry
• https://zmain.info/blog/plex2shell , Third Party Advisory
• https://www.boredhackerblog.info/2026/10/plex-vulnerabilities-being-exploited-in.html , Third Party Advisory
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-96656 , US Government Resource

En bref

CVSS: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

EPSS : probabilité estimée d'exploitation dans les 30 prochains jours.

Produits concernés

Sources officielles

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