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11 vulnerabilities by Orthanc
CVE-2026-5439 (GCVE-0-2026-5439)
Vulnerability from cvelistv5 – Published: 2026-04-09 14:44 – Updated: 2026-04-14 16:34
VLAI?
Title
Memory Exhaustion via Forged ZIP Metadata
Summary
A memory exhaustion vulnerability exists in ZIP archive processing. Orthanc automatically extracts ZIP archives uploaded to certain endpoints and trusts metadata fields describing the uncompressed size of archived files. An attacker can craft a small ZIP archive containing a forged size value, causing the server to allocate extremely large buffers during extraction.
Severity ?
7.5 (High)
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Orthanc | DICOM Server |
Affected:
0 , ≤ 1.12.10
(custom)
|
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CVE-2026-5437 (GCVE-0-2026-5437)
Vulnerability from cvelistv5 – Published: 2026-04-09 14:44 – Updated: 2026-04-14 16:34
VLAI?
Title
Out-of-Bounds Read in DicomStreamReader
Summary
An out-of-bounds read vulnerability exists in `DicomStreamReader` during DICOM meta-header parsing. When processing malformed metadata structures, the parser may read beyond the bounds of the allocated metadata buffer. Although this issue does not typically crash the server or expose data directly to the attacker, it reflects insufficient input validation in the parsing logic.
Severity ?
7.5 (High)
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Orthanc | DICOM Server |
Affected:
0 , ≤ 1.12.10
(custom)
|
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CVE-2026-5438 (GCVE-0-2026-5438)
Vulnerability from cvelistv5 – Published: 2026-04-09 14:44 – Updated: 2026-04-14 16:34
VLAI?
Title
Gzip Decompression Bomb via Content-Encoding Header
Summary
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.
Severity ?
7.5 (High)
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Orthanc | DICOM Server |
Affected:
0 , ≤ 1.12.10
(custom)
|
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CVE-2026-5440 (GCVE-0-2026-5440)
Vulnerability from cvelistv5 – Published: 2026-04-09 14:43 – Updated: 2026-04-14 16:34
VLAI?
Title
Memory Exhaustion via Unbounded Content-Length
Summary
A memory exhaustion vulnerability exists in the HTTP server due to unbounded use of the `Content-Length` header. The server allocates memory directly based on the attacker supplied header value without enforcing an upper limit. A crafted HTTP request containing an extremely large `Content-Length` value can trigger excessive memory allocation and server termination, even without sending a request body.
Severity ?
7.5 (High)
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Orthanc | DICOM Server |
Affected:
0 , ≤ 1.12.10
(custom)
|
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CVE-2026-5442 (GCVE-0-2026-5442)
Vulnerability from cvelistv5 – Published: 2026-04-09 14:43 – Updated: 2026-04-14 16:34
VLAI?
Title
Heap Buffer Overflow in DICOM Image Decoder via VR UL Dimensions
Summary
A heap buffer overflow vulnerability exists in the DICOM image decoder. Dimension fields are encoded using Value Representation (VR) Unsigned Long (UL), instead of the expected VR Unsigned Short (US), which allows extremely large dimensions to be processed. This causes an integer overflow during frame size calculation and results in out-of-bounds memory access during image decoding.
Severity ?
9.8 (Critical)
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Orthanc | DICOM Server |
Affected:
0 , ≤ 1.12.10
(custom)
|
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CVE-2026-5443 (GCVE-0-2026-5443)
Vulnerability from cvelistv5 – Published: 2026-04-09 14:43 – Updated: 2026-04-14 16:34
VLAI?
Title
Heap Buffer Overflow in DICOM Image Decoder (Palette Color Decode)
Summary
A heap buffer overflow vulnerability exists during the decoding of `PALETTE COLOR` DICOM images. Pixel length validation uses 32-bit multiplication for width and height calculations. If these values overflow, the validation check incorrectly succeeds, allowing the decoder to read and write to memory beyond allocated buffers.
Severity ?
9.8 (Critical)
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Orthanc | DICOM Server |
Affected:
0 , ≤ 1.12.10
(custom)
|
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CVE-2026-5445 (GCVE-0-2026-5445)
Vulnerability from cvelistv5 – Published: 2026-04-09 14:42 – Updated: 2026-04-14 16:34
VLAI?
Title
Out-of-Bounds Read in DicomImageDecoder (DecodeLookupTable)
Summary
An out-of-bounds read vulnerability exists in the `DecodeLookupTable` function within `DicomImageDecoder.cpp`. The lookup-table decoding logic used for `PALETTE COLOR` images does not validate pixel indices against the lookup table size. Crafted images containing indices larger than the palette size cause the decoder to read beyond allocated lookup table memory and expose heap contents in the output image.
Severity ?
9.1 (Critical)
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Orthanc | DICOM Server |
Affected:
0 , ≤ 1.12.10
(custom)
|
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CVE-2026-5444 (GCVE-0-2026-5444)
Vulnerability from cvelistv5 – Published: 2026-04-09 14:42 – Updated: 2026-04-14 16:34
VLAI?
Title
Heap Buffer Overflow in PAM Image Buffer Allocation
Summary
A heap buffer overflow vulnerability exists in the PAM image parsing logic. When Orthanc processes a crafted PAM image embedded in a DICOM file, image dimensions are multiplied using 32-bit unsigned arithmetic. Specially chosen values can cause an integer overflow during buffer size calculation, resulting in the allocation of a small buffer followed by a much larger write operation during pixel processing.
Severity ?
7.1 (High)
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Orthanc | DICOM Server |
Affected:
0 , ≤ 1.12.10
(custom)
|
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CVE-2026-5441 (GCVE-0-2026-5441)
Vulnerability from cvelistv5 – Published: 2026-04-09 14:42 – Updated: 2026-04-14 16:35
VLAI?
Title
Out-of-Bounds Read in DicomImageDecoder (PMSCT_RLE1 Decompression)
Summary
An out-of-bounds read vulnerability exists in the `DecodePsmctRle1` function of `DicomImageDecoder.cpp`. The `PMSCT_RLE1` decompression routine, which decodes the proprietary Philips Compression format, does not properly validate escape markers placed near the end of the compressed data stream. A crafted sequence at the end of the buffer can cause the decoder to read beyond the allocated memory region and leak heap data into the rendered image output.
Severity ?
7.1 (High)
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Orthanc | DICOM Server |
Affected:
0 , ≤ 1.12.10
(custom)
|
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CVE-2025-0896 (GCVE-0-2025-0896)
Vulnerability from cvelistv5 – Published: 2025-02-13 01:02 – Updated: 2025-02-13 16:44
VLAI?
Title
Orthanc Server Missing Authentication for Critical Function
Summary
Orthanc server prior to version 1.5.8 does not enable basic authentication by default when remote access is enabled. This could result in unauthorized access by an attacker.
Severity ?
9.8 (Critical)
CWE
- CWE-306 - Missing Authentication for Critical Function
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Orthanc | Orthanc server |
Affected:
0 , < 1.5.8
(custom)
|
Date Public ?
2025-02-06 17:00
Credits
Amitay Dan reported this vulnerability to Orthanc
Souvik Kandar reported this vulnerability to CISA
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CVE-2023-7238 (GCVE-0-2023-7238)
Vulnerability from cvelistv5 – Published: 2024-01-23 19:20 – Updated: 2025-06-17 21:19
VLAI?
Title
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Orthanc Osimis DICOM Web Viewer
Summary
A XSS payload can be uploaded as a DICOM study and when a user tries to view the infected study inside the Osimis WebViewer the XSS vulnerability gets triggered. If exploited, the attacker will be able to execute arbitrary JavaScript code inside the victim's browser.
Severity ?
7.1 (High)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Orthanc | Osimis DICOM Web Viewer |
Affected:
1.4.2.0-9d9eff4
|
Credits
Noam Moshe of Claroty Team82
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"value": "\n\n\u003cp\u003eOrthanc recommends users mitigate this vulnerability by updating to the Docker images and Windows installers to Orthanc version 24.1.2 or greater.\u003c/p\u003e\u003cp\u003eReview Orthanc\u0027s \u003ca target=\"_blank\" rel=\"nofollow\" href=\"https://discourse.orthanc-server.org/t/osimis-web-viewer-1-4-3/4206\"\u003esecurity bullentin\u003c/a\u003e\u0026nbsp;for more details.\u003c/p\u003e\n\n\u003cbr\u003e"
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"title": "Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027) in Orthanc Osimis DICOM Web Viewer",
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"dateReserved": "2024-01-22T16:41:11.753Z",
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