HDFGroup HDF5 up to 1.14.1-2 Memmove Call H5T__conv_struct use after free

CVSS Meta Temp Score
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CTI Interest Score
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6.5$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in HDFGroup HDF5 up to 1.14.1-2. Affected by this issue is the function H5T__conv_struct of the component Memmove Call Handler. This manipulation causes use after free. This vulnerability is registered as CVE-2026-34734. The attack needs to be launched locally. No exploit is available.

Detailsinfo

A vulnerability has been found in HDFGroup HDF5 up to 1.14.1-2 and classified as critical. Affected by this vulnerability is the function H5T__conv_struct of the component Memmove Call Handler. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-34734 since 03/30/2026. The exploitation appears to be easy. An attack has to be approached locally. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 305978 (Linux Distros Unpatched Vulnerability : CVE-2026-34734), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (305978). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.5

VulDB Base Score: 5.3
VulDB Temp Score: 5.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.8
CNA Vector (GitHub_M): 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 305978
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-34734

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

03/30/2026 CVE reserved
04/09/2026 +10 days Advisory disclosed
04/09/2026 +0 days VulDB entry created
04/12/2026 +2 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-34734 (🔒)
GCVE (CVE): GCVE-0-2026-34734
GCVE (VulDB): GCVE-100-356665

Entryinfo

Created: 04/09/2026 22:04
Updated: 04/12/2026 01:24
Changes: 04/09/2026 22:04 (64), 04/12/2026 01:24 (2)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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