---
id: "CVE-2026-107621"
kind: "vulnerability"
aliases: ["CVE-2026-107621"]
title: "JPEGParser: crafted or truncated JPEG stream causes infinite 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", "denial-of-service", "dicom", "healthcare", "java", "jpeg", "package", "parsing", "python", "self-hosted"]
not_affected_if: ["no-untrusted-jpeg-input", "not-network-exposed"]
published_at: "2026-10-16T15:17:05+00:00"
first_seen_at: "2026-10-23T21:57:13+00:00"
updated_at: "2026-10-24T00:26:43+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-107621", "first_seen_at": "2026-10-23T21:57:13+00:00"}, {"source": "analyst", "url": null, "first_seen_at": "2026-10-24T00:26:43+00:00"}]
---

# JPEGParser: crafted or truncated JPEG stream causes infinite loop

The JPEGParser in J4Care dcm4chee-arc-light (a DICOM medical image archive) can loop forever on a crafted or truncated JPEG stream. A remote unauthenticated sender can pin CPU and make the archive unresponsive (CWE-835). It is one of six flaws fixed together in 5.35.2.

_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 installed dcm4chee-arc-light version (archive UI or deployment image tag). 5.35.1 is affected per CISA; earlier versions are not confirmed either way. Exposed if the archive accepts DICOM or upload traffic from untrusted networks.

## Fix

Upgrade dcm4chee-arc-light to 5.35.2 or later (J4Care's fix per CISA ICSMA-26-288-02). Until then, keep the archive off the internet and behind a firewall or VPN.

## Timeline

- 2026-10-23T21:57:13+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-107621
- 2026-10-24T00:26:43+00:00 analyst — Product is J4Care dcm4chee-arc-light (Java DICOM archive), not a Python package; CISA ICSMA-26-288-02 lists 5.35.1 affected, fix 5.35.2 or later. No exploitation reported; no PoC found. Did not find J4Care's own release page, so upper bound of affected range (earlier versions) is unverified. Skipped social search (niche).

## Documents

- [advisory] CISA ICSMA-26-288-02 J4Care dcm4che https://www.cisa.gov/news-events/ics-medical-advisories/icsma-26-288-02
- [mentions] NVD CVE-2026-107621 https://nvd.nist.gov/vuln/detail/CVE-2026-107621

## From the sources

JPEGParser can enter an infinite loop while parsing a specially crafted or truncated stream.

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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_