OFFIS DCMTK Toolkit

Summary

Multiple critical vulnerabilities have been disclosed in the OFFIS DCMTK Toolkit, affecting versions up to and including 3.7.0. These vulnerabilities, including path traversal, memory leaks, and type confusion, could allow attackers to write files, access unauthorized information, exhaust memory, or crash affected processes. The DCMTK toolkit is used in critical infrastructure sectors like healthcare and public health, deployed worldwide.

Full text

ICS Medical Advisory OFFIS DCMTK Toolkit Release DateJune 30, 2026 Alert CodeICSMA-26-181-01 Related topics: Industrial Control System Vulnerabilities , Industrial Control Systems View CSAF Summary Successful exploitation of these vulnerabilities could allow an attacker to write files, access unauthorized information, exhaust memory, or crash affected DCMTK client or server processes. The following versions of OFFIS DCMTK Toolkit are affected: DCMTK <=3.7.0 (CVE-2026-50003, CVE-2026-50254, CVE-2026-35505, CVE-2026-52868, CVE-2026-44628) CVSS Vendor Equipment Vulnerabilities v3 9.8 OFFIS OFFIS DCMTK Toolkit Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), Missing Release of Memory after Effective Lifetime, Access of Resource Using Incompatible Type ('Type Confusion') Background Critical Infrastructure Sectors: Healthcare and Public Health Countries/Areas Deployed: Worldwide Company Headquarters Location: Germany Vulnerabilities Expand All + CVE-2026-50003 A malicious or compromised server can make a DCMTK client using bit-preserving C-GET storage mode write files outside the chosen output directory, using both relative (../) paths and absolute paths. View CVE Details Affected Products OFFIS DCMTK Toolkit Vendor:OFFIS Product Version:OFFIS DCMTK: <=3.7.0 Product Status:known_affected Remediations MitigationThe maintainer was notified of these vulnerabilities and has provided a fix. The fix is included in the latest commits and can be obtained in the following snapshot: Vendor fixhttps://github.com/DCMTK/dcmtk/releases/tag/latest.https://github.com/DCMTK/dcmtk/releases/tag/latest MitigationUsers are recommended to download the latest GitHub release once it becomes available. Relevant CWE: CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') Metrics CVSS Version Base Score Base Severity Vector String 3.1 9.8 CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H 4.0 9.3 CRITICAL CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVE-2026-50254 An unauthenticated remote attacker can repeatedly send a single crafted connection request to leak memory. Against storescp in its default single-process mode, memory grows quickly and the service is eventually killed, after which it stops accepting connections until an operator restarts it. View CVE Details Affected Products OFFIS DCMTK Toolkit Vendor:OFFIS Product Version:OFFIS DCMTK: <=3.7.0 Product Status:known_affected Remediations MitigationThe maintainer was notified of these vulnerabilities and has provided a fix. The fix is included in the latest commits and can be obtained in the following snapshot: Vendor fixhttps://github.com/DCMTK/dcmtk/releases/tag/latest.https://github.com/DCMTK/dcmtk/releases/tag/latest MitigationUsers are recommended to download the latest GitHub release once it becomes available. Relevant CWE: CWE-401 Missing Release of Memory after Effective Lifetime Metrics CVSS Version Base Score Base Severity Vector String 3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 4.0 8.7 HIGH CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVE-2026-35505 An unauthenticated remote attacker can repeatedly send crafted connection requests to leak memory. In single-process deployments the memory grows until the service is killed and the port stops responding until restart. View CVE Details Affected Products OFFIS DCMTK Toolkit Vendor:OFFIS Product Version:OFFIS DCMTK: <=3.7.0 Product Status:known_affected Remediations MitigationThe maintainer was notified of these vulnerabilities and has provided a fix. The fix is included in the latest commits and can be obtained in the following snapshot: Vendor fixhttps://github.com/DCMTK/dcmtk/releases/tag/latest.https://github.com/DCMTK/dcmtk/releases/tag/latest MitigationUsers are recommended to download the latest GitHub release once it becomes available. Relevant CWE: CWE-401 Missing Release of Memory after Effective Lifetime Metrics CVSS Version Base Score Base Severity Vector String 3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 4.0 8.7 HIGH CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVE-2026-52868 An unauthenticated attacker can read worklist records from a directory outside the intended per-AE worklist storage area. In a multi-area deployment, this can cross departmental or clinic data separation. View CVE Details Affected Products OFFIS DCMTK Toolkit Vendor:OFFIS Product Version:OFFIS DCMTK: <=3.7.0 Product Status:known_affected Remediations MitigationThe maintainer was notified of these vulnerabilities and has provided a fix. The fix is included in the latest commits and can be obtained in the following snapshot: Vendor fixhttps://github.com/DCMTK/dcmtk/releases/tag/latest.https://github.com/DCMTK/dcmtk/releases/tag/latest MitigationUsers are recommended to download the latest GitHub release once it becomes available. Relevant CWE: CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') Metrics CVSS Version Base Score Base Severity Vector String 3.1 8.2 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N 4.0 8.8 HIGH CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N CVE-2026-44628 An unauthenticated attacker can crash the worklist server with a single crafted query when the server has a valid Called AE Title / storage directory, the expected lockfile, and at least one matching worklist record. View CVE Details Affected Products OFFIS DCMTK Toolkit Vendor:OFFIS Product Version:OFFIS DCMTK: <=3.7.0 Product Status:known_affected Remediations MitigationThe maintainer was notified of these vulnerabilities and has provided a fix. The fix is included in the latest commits and can be obtained in the following snapshot: Vendor fixhttps://github.com/DCMTK/dcmtk/releases/tag/latest.https://github.com/DCMTK/dcmtk/releases/tag/latest MitigationUsers are recommended to download the latest GitHub release once it becomes available. Relevant CWE: CWE-843 Access of Resource Using Incompatible Type ('Type Confusion') Metrics CVSS Version Base Score Base Severity Vector String 3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 4.0 8.7 HIGH CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N Acknowledgments Abhinav Agarwal reported these vulnerabilities to CISA Legal Notice and Terms of Use This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy). Recommended Practices CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet. Locate control system networks and remote devices behind firewalls and isolating them from business networks. When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as the connected devices. CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies. CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets. Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies. Organizations observing suspected malicious activity shou

Indicators of Compromise

• cve — CVE-2026-50003
• cve — CVE-2026-50254
• cve — CVE-2026-35505
• cve — CVE-2026-52868
• cve — CVE-2026-44628

Entities