OFFIS DCMTK Toolkit
All CISA Advisories, CISA, June 30, 2026
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
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.
Affected Products
OFFIS DCMTK Toolkit
OFFIS
OFFIS DCMTK: <=3.7.0
known_affected
Remediations
Mitigation
The 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 fix
https://github.com/DCMTK/dcmtk/releases/tag/latest.
https://github.com/DCMTK/dcmtk/releases/tag/latest
Mitigation
Users 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.
Affected Products
OFFIS DCMTK Toolkit
OFFIS
OFFIS DCMTK: <=3.7.0
known_affected
Remediations
Mitigation
The 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 fix
https://github.com/DCMTK/dcmtk/releases/tag/latest.
https://github.com/DCMTK/dcmtk/releases/tag/latest
Mitigation
Users 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.
Affected Products
OFFIS DCMTK Toolkit
OFFIS
OFFIS DCMTK: <=3.7.0
known_affected
Remediations
Mitigation
The 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 fix
https://github.com/DCMTK/dcmtk/releases/tag/latest.
https://github.com/DCMTK/dcmtk/releases/tag/latest
Mitigation
Users 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.
Affected Products
OFFIS DCMTK Toolkit
OFFIS
OFFIS DCMTK: <=3.7.0
known_affected
Remediations
Mitigation
The 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 fix
https://github.com/DCMTK/dcmtk/releases/tag/latest.
https://github.com/DCMTK/dcmtk/releases/tag/latest
Mitigation
Users 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.
Affected Products
OFFIS DCMTK Toolkit
OFFIS
OFFIS DCMTK: <=3.7.0
known_affected
Remediations
Mitigation
The 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 fix
https://github.com/DCMTK/dcmtk/releases/tag/latest.
https://github.com/DCMTK/dcmtk/releases/tag/latest
Mitigation
Users 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 should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.
CISA also recommends users take the following measures to protect themselves from social engineering attacks:
Do not click web links or open attachments in unsolicited email messages.
Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams.
Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks.
No known public exploitation specifically targeting these vulnerabilities has been reported to CISA at this time.
Revision History
- Initial Release Date: 2026-06-30
| Date | Revision | Summary |
|---|---|---|
| 2026-06-30 | 1 | Initial Publication |
