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High · 7.5 CVE-2026-5440 EUVD-2026-20917GHSA-826q-ppf7-8g9v

Memory Exhaustion via Unbounded Content-Length

Published Apr 9, 2026 · Updated Apr 14, 2026 · Assigned by certcc

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.

Affected products

VendorProductAffectedFixed
Orthanc DICOM Server ≤ 1.12.10 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
Debian 14 orthanc 1.12.10+dfsg-4 —
Debian 13 orthanc No fix yet —
Debian 12 orthanc No fix yet —
ReleasePackageFixed inAdvisory
Ubuntu 26.10 orthanc No fix yet —
Ubuntu 26.04 LTS orthanc No fix yet —
Ubuntu 25.10 orthanc No fix yet —
Ubuntu 24.04 LTS orthanc No fix yet —
Ubuntu 22.04 LTS orthanc No fix yet —
Show 3 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
Ubuntu 20.04 LTS orthanc No fix yet —
Ubuntu 18.04 LTS orthanc No fix yet —
Ubuntu 16.04 LTS orthanc No fix yet —

References