What is the CVSS score of CVE-2026-29043?

CVE-2026-29043 has a CVSS 3.1 base score of 5.5 (Medium). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.0%.

Is there a patch available for CVE-2026-29043?

Yes, a patch is available for CVE-2026-29043. Update the affected software to the latest version immediately.

Hdf5 CVE-2026-29043

EUVD-2026-21406 MEDIUM

Heap-based Buffer Overflow (CWE-122)

2026-04-10 GitHub_M

RCE Buffer Overflow Heap Overflow Red Hat Hdf5 Suse Hdfgroup

5.5

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

5.5 MEDIUM

AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

SUSE

MEDIUM

qualitative

Red Hat

5.5 MEDIUM

qualitative

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

EUVD ID Assigned

Apr 10, 2026 - 16:00 euvd

EUVD-2026-21406

Analysis Generated

Apr 10, 2026 - 16:00 vuln.today

CVE Published

Apr 10, 2026 - 15:35 nvd

MEDIUM 5.5

DescriptionGitHub Advisory

HDF5 is software for managing data. In 1.14.1-2 and earlier, an attacker who can control an h5 file parsed by HDF5 can trigger a write-based heap buffer overflow condition in the H5T__ref_mem_setnull method. This can lead to a denial-of-service condition, and potentially further issues such as remote code execution depending on the practical exploitability of the heap overflow against modern operating systems.

AnalysisAI

Heap buffer overflow in HDF5 library versions 1.14.1-2 and earlier allows local attackers to trigger a write-based overflow in the H5T__ref_mem_setnull method by crafting malicious HDF5 files, leading to denial-of-service and potential remote code execution depending on heap exploitation complexity. Attack requires local file access and user interaction to parse a malicious file. No public exploit code identified at time of analysis.

Technical ContextAI

HDF5 (Hierarchical Data Format 5) is a widely-used library for managing large and complex datasets. The vulnerability resides in the H5T__ref_mem_setnull method, which handles reference type memory operations during HDF5 file parsing. The root cause is classified as CWE-122 (Heap-based Buffer Overflow), a memory safety flaw where buffer boundary checks are insufficient when writing to heap-allocated memory. An attacker who controls the structure and content of a crafted HDF5 file can supply specially-formatted reference data that exceeds allocated buffer boundaries, corrupting adjacent heap structures. This affects all versions of the HDF5 library (CPE: cpe:2.3:a:hdfgroup:hdf5:*:*:*:*:*:*:*:*) up to and including version 1.14.1-2.

RemediationAI

Upgrade HDF5 to a patched version released after 1.14.1-2 as specified by the HDFGroup security advisory. If immediate upgrade is not feasible, avoid opening HDF5 files from untrusted or external sources, and restrict HDF5 file parsing to trusted data pipelines. Validate HDF5 file integrity before processing when possible. Users of applications embedding HDF5 should check vendor release notes for patched versions and apply updates promptly. Refer to the official advisory at https://github.com/HDFGroup/hdf5/security/advisories/GHSA-qm2m-5g5w-2277 for exact patched version numbers and deployment instructions.