Is CVE-2026-29043 actively exploited?

A proof-of-concept exploit is publicly available for CVE-2026-29043, but active exploitation has not been confirmed.

Can CVE-2026-29043 be exploited remotely?

No. CVE-2026-29043 requires local access to exploit.

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

CVE-2026-29043 has a CVSS score of 5.5 (MEDIUM).

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MEDIUMPOC

CVE-2026-29043

CWE-122Published: April 10, 2026· Updated: Apr 16, 2026

5.5

CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-29043 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 5.5.

A proof-of-concept (PoC) exploit exists for CVE-2026-29043. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.