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CVE-2026-34734 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: redhat-SADPCVSS-B:7.8 HIGHVector:CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://access.redhat.com/security/cve/CVE-2026-34734	redhat-SADP
https://bugzilla.redhat.com/show_bug.cgi?id=2457034	redhat-SADP
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34734.json	redhat-SADP
https://github.com/HDFGroup/hdf5/security/advisories/GHSA-w7v2-9cmr-pwwj	CISA-ADP	ExploitVendor Advisory
https://github.com/HDFGroup/hdf5/security/advisories/GHSA-w7v2-9cmr-pwwj	[email protected]	ExploitVendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-416	Use After Free	[email protected]
CWE-825	Expired Pointer Dereference	redhat-SADP

Affected Products

Product	Versions
hdfgroup hdf5	< 1.14.1-2
CPE cpe:2.3:a:hdfgroup:hdf5:::::::: Remediation No remediation found in references.

Change History

7 change records found show changes

Date	Action	Recorded By
Jul 15, 2026	CVE Modified	redhat-SADP
Jun 30, 2026	CVE Modified	redhat-SADP
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Apr 14, 2026	Initial Analysis	[email protected]
Apr 13, 2026	CVE Modified	CISA-ADP
Apr 9, 2026	New CVE Received	[email protected]