Medium [CVE-2026-26199] Denial of Service via buffer underflow in H5Iget_name
This medium-severity Red Hat Linux advisory covers CVE-2026-26199 affecting Red Hat AI Inference Server, Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat OpenShift AI (RHOAI).
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Summary
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. A flaw was found in HDF5, a library used for managing large datasets.
This vulnerability occurs when a specific function, H5Iget_name, is called with an invalid size parameter, leading to a buffer underflow. An attacker could exploit this by providing specially crafted input, potentially causing the application to crash or become unavailable, resulting in a denial of service (DoS).
This Moderate vulnerability in HDF5 involves a buffer underflow in the `H5Iget_name` function, which can lead to a denial of service. Exploitation requires an attacker to provide specially crafted input that forces the `size` parameter to zero, a condition not commonly encountered in default Red Hat configurations, thus limiting the attack's practicality.
Red Hat severity: Moderate — CVSS 5.3 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H). Weakness: CWE-124.
Affected Red Hat products: Red Hat AI Inference Server; Red Hat Enterprise Linux AI (RHEL AI) 3; Red Hat OpenShift AI (RHOAI).
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · medium-confidence parse· fetched 8 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 8 days ago·verify at source
Mitigation
The source record does not include mitigation steps. That does not mean no fix exists. Read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 8 days ago·verify at source
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