CVE-2026-5438 | Orthanc DICOM Server up to 1.12.10 Gzip Content-Encoding allocation of resources

VDB-356576 · CVE-2026-5438 · GCVE-0-2026-5438 ORTHANC DICOM SERVER UP TO 1.12.10 GZIP CONTENT-ENCODING ALLOCATION OF RESOURCES HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 4.3 $0-$5k 0.00+ Summaryinfo A vulnerability labeled as problematic has been found in Orthanc DICOM Server up to 1.12.10. Affected by this vulnerability is an unknown functionality of the component Gzip Handler. Such manipulation of the argument Content-Encoding leads to allocation of resources. This vulnerability is documented as CVE-2026-5438. The attack can be executed remotely. There is not any exploit available. Detailsinfo A vulnerability was found in Orthanc DICOM Server up to 1.12.10 and classified as problematic. Affected by this issue is an unknown part of the component Gzip Handler. The manipulation of the argument Content-Encoding with an unknown input leads to a allocation of resources vulnerability. Using CWE to declare the problem leads to CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. Impacted is availability. CVE summarizes: A gzip decompression bomb vulnerability exists when Orthanc processes HTTP request with `Content-Encoding: gzip`. The server does not enforce limits on decompressed size and allocates memory based on attacker-controlled compression metadata. A specially crafted gzip payload can trigger excessive memory allocation and exhaust system memory. This vulnerability is handled as CVE-2026-5438 since 04/02/2026. The exploitation is known to be easy. The attack may be launched remotely. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499. There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product. Productinfo Vendor Orthanc Name DICOM Server Version 1.12.0 1.12.1 1.12.2 1.12.3 1.12.4 1.12.5 1.12.6 1.12.7 1.12.8 1.12.9 1.12.10 CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 4.3 VulDB Meta Temp Score: 4.3 VulDB Base Score: 4.3 VulDB Temp Score: 4.3 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Allocation of resources CWE: CWE-770 / CWE-400 / CWE-404 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: no mitigation known Status: 🔍 0-Day Time: 🔒 Timelineinfo 04/02/2026 CVE reserved 04/09/2026 +7 days Advisory disclosed 04/09/2026 +0 days VulDB entry created 04/09/2026 +0 days VulDB entry last update Sourcesinfo Status: Not defined CVE: CVE-2026-5438 (🔒) GCVE (CVE): GCVE-0-2026-5438 GCVE (VulDB): GCVE-100-356576 Entryinfo Created: 04/09/2026 17:31 Changes: 04/09/2026 17:31 (52) Complete: 🔍 Cache ID: 99:81D:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸