CVE-2026-5444
CVE-2026-5444 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-787.
Key facts
- Severity: High (CVSS 3.x base score 7.1)
- EPSS exploit prediction: 0% (6th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-20924
- Weakness: CWE-787
- Affected product: Orthanc-server Orthanc
- Published:
- Last modified:
Description
A heap buffer overflow vulnerability exists in the PAM image parsing logic. When Orthanc processes a crafted PAM image embedded in a DICOM file, image dimensions are multiplied using 32-bit unsigned arithmetic. Specially chosen values can cause an integer overflow during buffer size calculation, resulting in the allocation of a small buffer followed by a much larger write operation during pixel processing.
Frequently asked questions
- What is CVE-2026-5444?
- A heap buffer overflow vulnerability exists in the PAM image parsing logic. When Orthanc processes a crafted PAM image embedded in a DICOM file, image dimensions are multiplied using 32-bit unsigned arithmetic. Specially chosen values can cause an integer overflow during buffer size calculation, resulting in the allocation of a small buffer followed by a much larger write operation during pixel processing.
- How severe is CVE-2026-5444?
- CVE-2026-5444 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 none, integrity high, and availability high.
- Is CVE-2026-5444 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-5444?
- CVE-2026-5444 affects Orthanc-server Orthanc. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-5444?
- 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-2026-5444 have an EU (EUVD) identifier?
- Yes. CVE-2026-5444 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20924.
- When was CVE-2026-5444 published?
- CVE-2026-5444 was published on 2026-04-09 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:orthanc-server:orthanc:*:*:*:*:*:*:*:*
More vulnerabilities in Orthanc-server Orthanc
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