CVE-2026-5441
CVE-2026-5441 is a high-severity vulnerability in Orthanc-server Orthanc with a CVSS 3.x base score of 7.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.
Key facts
- Severity: High (CVSS 3.x base score 7.1)
- EPSS exploit prediction: 0% (3rd percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-20918
- Weakness: CWE-125
- Affected product: Orthanc-server Orthanc
- Published:
- Last modified:
Description
An out-of-bounds read vulnerability exists in the `DecodePsmctRle1` function of `DicomImageDecoder.cpp`. The `PMSCT_RLE1` decompression routine, which decodes the proprietary Philips Compression format, does not properly validate escape markers placed near the end of the compressed data stream. A crafted sequence at the end of the buffer can cause the decoder to read beyond the allocated memory region and leak heap data into the rendered image output.
Frequently asked questions
- What is CVE-2026-5441?
- An out-of-bounds read vulnerability exists in the `DecodePsmctRle1` function of `DicomImageDecoder.cpp`. The `PMSCT_RLE1` decompression routine, which decodes the proprietary Philips Compression format, does not properly validate escape markers placed near the end of the compressed data stream. A crafted sequence at the end of the buffer can cause the decoder to read beyond the allocated memory region and leak heap data into the rendered image output.
- How severe is CVE-2026-5441?
- CVE-2026-5441 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability high.
- Is CVE-2026-5441 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-5441?
- CVE-2026-5441 affects Orthanc-server Orthanc. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-5441?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2026-5441 have an EU (EUVD) identifier?
- Yes. CVE-2026-5441 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20918.
- When was CVE-2026-5441 published?
- CVE-2026-5441 was published on 2026-04-09 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:orthanc-server:orthanc:*:*:*:*:*:*:*:*
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