---
id: "CVE-2026-105273"
kind: "vulnerability"
aliases: ["CVE-2026-105273"]
title: "MP4Parser: malformed box sizes cause endless parsing loop"
severity: "high"
cvss: 8.7
epss: null
exploited: false
status: "open"
category: "package"
products: [{"name": "dcm4chee-arc-light", "fixed": ["5.35.2"], "affected": "5.35.1", "ecosystem": "vendor"}]
ecosystems: []
tags: ["dcm4chee", "dcm4chee-arc-light", "denial-of-service", "dicom", "healthcare", "j4care", "media-processing", "mp4parser", "package", "self-hosted"]
not_affected_if: ["no-untrusted-mp4-input"]
published_at: "2026-10-16T15:17:03+00:00"
first_seen_at: "2026-10-23T21:57:13+00:00"
updated_at: "2026-10-24T00:27:46+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-105273", "first_seen_at": "2026-10-23T21:57:13+00:00"}, {"source": "analyst", "url": null, "first_seen_at": "2026-10-24T00:27:46+00:00"}]
---

# MP4Parser: malformed box sizes cause endless parsing loop

The MP4Parser component of J4Care dcm4chee-arc-light (DICOM medical image archive) does not validate MP4 box sizes. A malformed box makes parsing loop without progress, so a remote unauthenticated attacker can cause denial of service (CWE-835). CISA CVSS v3.1 7.5, v4.0 8.7. Same CISA advisory covers five sibling CVEs in the same release.

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

## Affected

- vendor:dcm4chee-arc-light affected 5.35.1 fixed 5.35.2

## How to check

Check the running dcm4chee-arc-light version (archive UI/about page or deployed package version). Version 5.35.1 is affected; earlier versions are not stated in the advisory (unknown).

## Fix

Upgrade dcm4chee-arc-light to 5.35.2 or later. Meanwhile, keep the archive off the internet and behind a firewall, per CISA.

## Timeline

- 2026-10-23T21:57:13+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-105273
- 2026-10-24T00:27:46+00:00 analyst — CISA ICSMA-26-288-02 (primary found via NVD): MP4Parser is a component of J4Care dcm4chee-arc-light 5.35.1; fixed in 5.35.2. No exploitation reported to CISA; no PoC found; no community posts searched (niche, no CVE-named conversation in web results). Exact affected range below 5.35.1 unknown; advisory lists only 5.35.1.

## Documents

- [advisory] CISA ICSMA-26-288-02 J4Care dcm4che https://www.cisa.gov/news-events/ics-medical-advisories/icsma-26-288-02
- [describes] NVD CVE-2026-105273 https://nvd.nist.gov/vuln/detail/CVE-2026-105273

## From the sources

MP4Parser does not adequately validate MP4 box sizes. A malformed box can cause parsing to make no forward progress and repeatedly process the same input.

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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_