Read the docs
TI-2026-04766 Aliases CVE-2026-5443GHSA-x69c-qfxw-mhm7

Heap Buffer Overflow in DICOM Image Decoder (Palette Color Decode)

Priority MEDIUM 50CWE-787Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.

Summary

A heap buffer overflow vulnerability exists during the decoding of `PALETTE COLOR` DICOM images. Pixel length validation uses 32-bit multiplication for width and height calculations. If these values overflow, the validation check incorrectly succeeds, allowing the decoder to read and write to memory beyond allocated buffers.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0058 47th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
OrthancDICOM Serverup to 1.12.10—No fix listedCNA
  • DICOM Server VendorOrthanc Affected up to 1.12.10 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:orthanc-server:orthanc:*:*:*:*:*:*:*:*before 1.12.11VulnerableOrthanc
  • cpe:2.3:a:orthanc-server:orthanc:*:*:*:*:*:*:*:* Versions before 1.12.11 Vulnerable ·Orthanc

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-5443
  2. 2026-10-03 Alias added: GHSA-x69c-qfxw-mhm7
  3. 2026-10-25 EPSS moved to the below the 50th percentile

References

Advisory 1

Other 2

  • TI-2025-00759 Orthanc Server Missing Authentication for Critical Function CVSS 4.0CRITICAL 9.2
  • TI-2026-04765 Heap Buffer Overflow in DICOM Image Decoder via VR UL Dimensions CVSS 3.1CRITICAL 9.8
  • TI-2023-16538 Orthanc before 1.12.0 allows authenticated users with access to the Orthanc API to… CVSS 3.1HIGH 8.8
  • TI-2026-04768 Out-of-Bounds Read in DicomImageDecoder (DecodeLookupTable) CVSS 3.1CRITICAL 9.1
  • TI-2026-04763 Memory Exhaustion via Unbounded Content-Length CVSS 3.1HIGH 7.5
  • TI-2026-04760 Out-of-Bounds Read in DicomStreamReader CVSS 3.1HIGH 7.5
See all 11 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences