CVE-2026-26199
MEDIUMDescription
HDF5 is a high-performance library and a file format specification that implements the HDF5 data model. If `H5Iget_name` is invoked on a group id with `0` for the size parameter, it will underflow when trying to place a null terminator in the buffer. This can occur if `H5Iget_name` is invoked in a way where `size` can be forced to zero, and there is important data before the `name` buffer.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Exploit Intelligence
Low risk: more likely to be exploited than 17% of all known CVEs.
References
Related Vulnerabilities
Other CWE-124 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2015-2426 | High | 8.8 | 87% | KEV | - |
| CVE-2023-25610 | Critical | 9.8 | 18% | - | Fix |
| CVE-2018-5388 | Medium | 6.5 | 4.0% | - | Fix |
| CVE-2018-15361 | Critical | 9.8 | 2.9% | - | Fix |
| CVE-2021-36064 | High | 7.8 | 2.7% | - | Fix |
| CVE-2023-48230 | Medium | 5.9 | 1.9% | - | Fix |
Common questions
How do I fix CVE-2026-26199?
Upgrade hdf5 to 2.1.0 or later.
Is CVE-2026-26199 being actively exploited?
Not that we know of. CVE-2026-26199 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.26% is the estimated probability that it will be exploited in the next 30 days. That is higher than 17% of all scored CVEs.
How severe is CVE-2026-26199?
CVE-2026-26199 has a CVSS v3 base score of 6.5, rated moderate. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-26199 affect?
Published advisories record a fix for hdf5 (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
Embed a live status badge for CVE-2026-26199
Markdown
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-29.