CVE-2026-87020 PUBLISHED

Orthanc DICOM Server Integer Overflow or Wraparound

Assigner: icscert
Reserved: 08.09.2026 Published: 11.09.2026 Updated: 11.09.2026

An integer overflow in a specified pitch and buffer-size computation leads to a heap out-of-bounds write when Orthanc DICOM Server decodes an attacker-supplied PNG.

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
CVSS Score: 8.1

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	Low	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS Score: 7.2

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

Product Status

Vendor	Orthanc
Product	DICOM Server
Versions	Default: unaffected affected from 0 to 1.13.0 (excl.) Version 1.13.0 is unaffected

Solutions

Orthanc recommends users update to v1.13.0. https://orthanc.uclouvain.be/downloads/index.html

CVE-2026-87020 PUBLISHED

Orthanc DICOM Server Integer Overflow or Wraparound

Metrics

Product Status

Solutions

Credits

References

Problem Types