CVE-2026-26199: 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, i

unknownCVE-2026-26199

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.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: unknown
Published: 2026-07-20
Last updated: 2026-07-23
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-26199

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-261990.26% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 17% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-26199	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

unknownCVE-2026-26199: Buffer underflow in `H5Iget_name `/`H5G_get_name` if size is zeromsrc

Recent advisories for HDF5 is a

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

mediumCVE-2026-9335: A vulnerability in keras-team/keras versions <= 3.14.0 allows arbitrary local HDF5 file content…nvd · 2026-08-02
unknownCVE-2026-17574: HDF5 contains a NULL pointer dereference vulnerability. Processing a crafted HDF5 file contain…nvd · 2026-07-27
unknownCVE-2026-17573: A double free vulnerability was discovered in the HDF5 library. Processing a crafted HDF5 file…nvd · 2026-07-27
unknownCVE-2026-17572: Heap-based buffer overflow in the SOHM list-index deserialization code in HDF5 through 2.1.1 o…nvd · 2026-07-27
unknownCVE-2026-26197: HDF5 is a high-performance library and a file format specification that implements the HDF5 da…nvd · 2026-07-20
mediumCVE-2026-12480: Arbitrary HDF5 File Read via Virtual Dataset Bypass in keras-team/kerasmsrc · 2026-07-14