PatchTheCVECVE-2026-5437: An out-of-bounds read vulnerability exists in `DicomStreamReader` during DICOM meta-header parsing
CVE-2026-5437 is a high-severity flaw (CVSS 7.5) affecting orthanc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- High severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.5 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.6% (top 50%) |
| CISA exploited list | No |
| Weakness | CWE-125 |
| Published | 2026-04-09 |
| Last modified | 2026-10-26 |
Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-5437?
orthanc: upgrade to 1.12.11. Exact commands for each OS are on this page.
Is CVE-2026-5437 being exploited?
CVE-2026-5437 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-5437 affect?
CVE-2026-5437 affects orthanc. Severity is high (CVSS 7.5). 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 d
How urgent is CVE-2026-5437?
Priority 44/100. High severity; Remotely exploitable, no login, no user action
Related CVEs
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- CVE-2026-5445 CRITICAL 9.1 UPGRADE An out-of-bounds read vulnerability exists in the `DecodeLookupTable` function within `DicomImageDecoder.cpp`
- CVE-2026-5440 HIGH 7.5 UPGRADE A memory exhaustion vulnerability exists in the HTTP server due to unbounded use of the `Content-Length` heade
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