CVE-2026-5437
CVE-2026-5437 is a high-severity vulnerability in Orthanc-server Orthanc with a CVSS 3.x base score of 7.5. 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 7.5)
- EPSS exploit prediction: 1% (46th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-20913
- Weakness: CWE-125
- Affected product: Orthanc-server Orthanc
- Published:
- Last modified:
Description
An out-of-bounds read vulnerability exists in `DicomStreamReader` during DICOM meta-header parsing. When processing malformed metadata structures, the parser may read beyond the bounds of the allocated metadata buffer. Although this issue does not typically crash the server or expose data directly to the attacker, it reflects insufficient input validation in the parsing logic.
Frequently asked questions
- What is CVE-2026-5437?
- An out-of-bounds read vulnerability exists in `DicomStreamReader` during DICOM meta-header parsing. When processing malformed metadata structures, the parser may read beyond the bounds of the allocated metadata buffer. Although this issue does not typically crash the server or expose data directly to the attacker, it reflects insufficient input validation in the parsing logic.
- How severe is CVE-2026-5437?
- CVE-2026-5437 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2026-5437 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-5437?
- CVE-2026-5437 affects Orthanc-server Orthanc. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-5437?
- 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-2026-5437 have an EU (EUVD) identifier?
- Yes. CVE-2026-5437 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20913.
- When was CVE-2026-5437 published?
- CVE-2026-5437 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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