PatchTheCVECVE-2026-26197: HDF5 is a high-performance library and a file format specification that implements the HDF5 data model
CVE-2026-26197 is a high-severity flaw (CVSS 7.5) affecting hdf5. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
HDF5 is a high-performance library and a file format specification that implements the HDF5 data model. If a file is corrupted such that an array datatype's size, the number of elements, and the element size are not in agreement it can trigger an out of bounds read. The array datatype stores the full size of the datatype (`dt->shared->size`) separately from the number of elements (`dt->shared->u.array.nelem`) and the element size (`dt->shared->p
Why this priority
- High severity
- Public exploit reference
- 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 | 0.4% (top 71%) |
| CISA exploited list | No |
| Weakness | CWE-125 |
| Published | 2026-07-20 |
| Last modified | 2026-10-24 |
Last updated 2026-10-24 · 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-2026-26197?
hdf5: upgrade to 2.1.0. Exact commands for each OS are on this page.
Is CVE-2026-26197 being exploited?
CVE-2026-26197 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-2026-26197 affect?
CVE-2026-26197 affects hdf5. Severity is high (CVSS 7.5). HDF5 is a high-performance library and a file format specification that implements the HDF5 data model. If a file is corrupted such that an array datatype's size, the number of elements, and the element size are not in agreement it can tri
How urgent is CVE-2026-26197?
Priority 44/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action
Related CVEs
- CVE-2026-26199 MEDIUM 6.5 UPGRADE HDF5 is a high-performance library and a file format specification that implements the HDF5 data model
- CVE-2026-17573 MEDIUM 5.5 UPGRADE A double free vulnerability was discovered in the HDF5 library
- CVE-2026-17572 MEDIUM 5.5 UPGRADE Heap-based buffer overflow in the SOHM list-index deserialization code in HDF5 through 2.1.1 on all platforms
- CVE-2026-17574 MEDIUM 5.5 UPGRADE HDF5 contains a NULL pointer dereference vulnerability