---
id: "CVE-2026-119739"
kind: "vulnerability"
aliases: ["CVE-2026-119739"]
title: "Nexbox A95X TV boxes: VobSub subtitle decoder memory corruption flaw"
severity: "medium"
cvss: 6.9
epss: null
exploited: false
status: "open"
category: "vendor"
products: []
ecosystems: []
tags: ["amlogic", "android", "iot", "nexbox-a95x", "tv-box", "vendor"]
not_affected_if: ["no-subtitle-service", "other-hardware", "port-10100-blocked"]
published_at: "2026-11-02T20:17:38+00:00"
first_seen_at: "2026-11-02T20:35:26+00:00"
updated_at: "2026-11-02T20:36:36+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-119739", "first_seen_at": "2026-11-02T20:35:26+00:00"}]
---

# Nexbox A95X TV boxes: VobSub subtitle decoder memory corruption flaw

The VobSub subtitle decoder in Amlogic's SubTitleService, shipped on Nexbox A95X TV boxes, writes past the end of a fixed array when given crafted subtitle data. An attacker can corrupt stack memory or crash the process, either over an unauthenticated TCP socket on port 10100 or through a malicious .sub file.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check whether the device is a Nexbox A95X (Amlogic S905X) TV box running the Amlogic DroidLogic SubTitleService.
- Check whether TCP port `10100` is reachable from the network.
- Check the firmware version on the device: unknown

## Timeline

- 2026-11-02T20:35:26+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-119739

## Documents

- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/amlogic-droidlogic-subtitleservice-out-of-bounds-write-via-vobsub-set-contr

## From the sources

The VobSub subtitle decoder libsub_vob (part of the Amlogic DroidLogic SubTitleService), as shipped on Nexbox A95X (Amlogic S905X) TV boxes, contains an out-of-bounds write vulnerability in vob_fill_pixel() that allows remote attackers to corrupt stack memory by sending a crafted SET_CONTR command with an attacker-controlled alpha value that drives an unbounded array index (change_data) past the end of the fixed four-element PixelDatas array. Attackers can exploit this by sending malicious VobSub data over the unauthenticated tcp/10100 socket or via a malicious .sub file to zero out adjacent stack bytes, resulting in silent stack corruption or process crash.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_