CVE-2026-5438

HIGH

7.5

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.

CVE Details

CVSS v3.1 Score7.5

SeverityHIGH

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published4/9/2026

Last Modified4/15/2026

Sourcenvd

Honeypot Sightings0

Affected Products

orthanc-server:orthanc

Weaknesses (CWE)

CWE-770

References

https://kb.cert.org/vuls/id/536588(cret@cert.org)

https://www.machinespirits.de/(cret@cert.org)

https://www.orthanc-server.com/(cret@cert.org)

IOC Correlations

No correlations recorded

This product uses data from the NVD API but is not endorsed or certified by the NVD.