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CVE-2026-5438— Gzip Decompression Bomb via Content-Encoding Header

Quick assessment

Affected
Orthanc DICOM Server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Orthanc是Orthanc公司的一款免费的开源软件。 Orthanc存在安全漏洞，该漏洞源于处理带有Content-Encoding: gzip的HTTP请求时存在gzip解压缩炸弹漏洞，可能导致触发过度内存分配并耗尽系统内存。

AI Predicted 7.5 Difficulty: Easy EPSS 0.76% · P55

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2026-5438

Vulnerability Information
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Vulnerability Title
Gzip Decompression Bomb via Content-Encoding Header
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Orthanc 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Orthanc是Orthanc公司的一款免费的开源软件。 Orthanc存在安全漏洞，该漏洞源于处理带有Content-Encoding: gzip的HTTP请求时存在gzip解压缩炸弹漏洞，可能导致触发过度内存分配并耗尽系统内存。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Orthanc DICOM Server 0 ~ 1.12.10 -

II. Public POCs for CVE-2026-5438

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III. Intelligence Information for CVE-2026-5438

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Vendor Advisories for CVE-2026-5438 (1)

Same Patch Batch · Orthanc · 2026-04-09 · 9 CVEs total

CVE-2026-5444 Heap Buffer Overflow in PAM Image Buffer Allocation
CVE-2026-5442 Heap Buffer Overflow in DICOM Image Decoder via VR UL Dimensions
CVE-2026-5441 Out-of-Bounds Read in DicomImageDecoder (PMSCT_RLE1 Decompression)
CVE-2026-5445 Out-of-Bounds Read in DicomImageDecoder (DecodeLookupTable)
CVE-2026-5440 Memory Exhaustion via Unbounded Content-Length
CVE-2026-5443 Heap Buffer Overflow in DICOM Image Decoder (Palette Color Decode)
CVE-2026-5439 Memory Exhaustion via Forged ZIP Metadata
CVE-2026-5437 Out-of-Bounds Read in DicomStreamReader

IV. Related Vulnerabilities

Same product: DICOM Server
Same vendor: Orthanc

V. Comments for CVE-2026-5438

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