What’s Vulnerable › Vulnerabilities
CVE-2026-5443: Heap Buffer Overflow in DICOM Image Decoder (Palette Color Decode)
- Severity: critical (CVSS 9.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.6% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-04-09 · updated 2026-10-26
- Weakness: CWE-787
Description
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.
Affected products
- orthanc-server orthanc: before 1.12.11 — fixed in 1.12.11
How to fix
Upgrade to a fixed version: orthanc-server orthanc 1.12.11. Check the vendor advisory for mitigations.
References
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