Dashboard / CVE-2026-5439

CVE-2026-5439

HIGH
MEDIUM Priority: 0.03 BB Relevance: 75/100
Published: 2026-04-09 Modified: 2026-10-26 First seen: 2026-10-29 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
S: Unchanged
C: None
I: None
A: High

Description

A memory exhaustion vulnerability exists in ZIP archive processing. Orthanc automatically extracts ZIP archives uploaded to certain endpoints and trusts metadata fields describing the uncompressed size of archived files. An attacker can craft a small ZIP archive containing a forged size value, causing the server to allocate extremely large buffers during extraction.

Weakness Classification (1)

Affected Software (1)

VendorProductVersion
orthanc-server orthanc < 1.12.11

References & Advisories (3)

https://kb.cert.org/vuls/id/536588
Third Party Advisory VDB Entry

Bug Bounty Relevance

75 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

7.5 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploitation Probability

0.43%
Raw Score 0.004260
Percentile 36.8%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00426
2026-10-28
0.00426

Intelligence Sources

nvd ref →

External Links