J4Care dcm4chee-arc-light: Denial of service via infinite loop in JPEG parser
Summary
J4Care dcm4chee-arc-light, a DICOM medical image archive server, is affected by an infinite loop in its JPEGParser when it parses a specially crafted or truncated stream. An unauthenticated remote attacker can cause the service to hang, resulting in a denial of service, with no confidentiality or integrity impact according to the CVSS vector. The advisory bundle ICSMA-26-288-02 also lists more serious issues in the same release, so the whole release should be patched.
Affected
- J4Care dcm4chee-arc-light 5.35.1 (per CISA and the vendor)
- Version 5.35.0 is reported by a third-party database only and is unverified.
Fixed in
- Upgrade to dcm4chee-arc-light 5.35.2 or later (vendor recommendation).
Workaround
Unknown. No workaround is documented for this CVE; the vendor recommends upgrading.
Exploitation
- No public proof of concept confirmed at this time.
- Not listed in the CISA Known Exploited Vulnerabilities catalog.
- CISA SSVC: exploitation none, automatable yes, technical impact partial.
- EPSS is low (0.00377).
Our recommendation
- Identify all dcm4chee-arc-light instances and their versions.
- Upgrade to 5.35.2 or later, which fixes the whole bundle, not only this CVE.
- Until patched, restrict DICOM and HL7 access to trusted systems and make sure the DICOM port is not reachable from the internet.
- Ask any PACS or radiology software vendor whether they embed dcm4che or dcm4chee-arc-light.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- CISA ICS Medical Advisory ICSMA-26-288-02 www.cisa.gov
- CISA CSAF file ICSMA-26-288-02 github.com
- dcm4chee-arc-light release 5.35.2 github.com
- VulDB entry 421299 vuldb.com
- SecurityFocus CVE-2026-107621 www.securityfocus.com
- threatint CVE-2026-107621 cve.threatint.com
- TheHackerWire CVE-2026-107621 www.thehackerwire.com
- Vulners MEND CVE-2026-107621 vulners.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 1 Nov 2026, 02:17.
Original description (NVD)
JPEGParser can enter an infinite loop while parsing a specially crafted or truncated stream.
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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