High severity · published Apr 9, 2026
CVE-2026-5440
Memory Exhaustion via Unbounded Content-Length
7.5
CVSS
0.6%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 47% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DS
DICOM Server · Orthanc
through 1.12.10 · source: vendor
OR
Orthanc · Orthanc-server
before 1.12.11 · source: NVD
Affected product
DS
DICOM Server
Orthanc
More from DICOM Server
9.8
CVE-2026-5442
Heap Buffer Overflow in DICOM Image Decoder via VR UL Dimensions
9.8
CVE-2026-5443
Heap Buffer Overflow in DICOM Image Decoder (Palette Color Decode)
9.1
CVE-2026-5445
Out-of-Bounds Read in DicomImageDecoder (DecodeLookupTable)
8.1
CVE-2026-87020
Orthanc DICOM Server Integer Overflow or Wraparound
7.5
CVE-2026-5439
Memory Exhaustion via Forged ZIP Metadata