Is CVE-2026-34734 actively exploited?

No active exploitation of CVE-2026-34734 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-34734 be exploited remotely?

No. CVE-2026-34734 requires local access to exploit.

What is the CVSS score of CVE-2026-34734?

CVE-2026-34734 has a CVSS score of 7.8 (HIGH).

HOME VULNERABILITIESCVE-2026-34734

HIGH

CVE-2026-34734

CWE-416Published: April 9, 2026· Updated: Apr 14, 2026

7.8

CVSS v3.1

EPSS:0.01%probability of exploitation in 30 daysPercentile:2.2th

Official Description

HDF5 is software for managing data. In 1.14.1-2 and earlier, a heap-use-after-free was found in the h5dump helper utility. An attacker who can supply a malicious h5 file can trigger a heap use-after-free. The freed object is referenced in a memmove call from H5T__conv_struct. The original object was allocated by H5D__typeinfo_init_phase3 and freed by H5D__typeinfo_term.

NVD Source

Technical Analysis

CVE-2026-34734 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 complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.

From a weakness classification perspective (CWE-416): Use-after-free vulnerabilities involve accessing memory after it has been freed, often enabling arbitrary code execution.