HDF Group HDF5 up to 2.1.0 h5dump render_bin_output null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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3.4$0-$5k3.05

Summaryinfo

A vulnerability has been found in HDF Group HDF5 up to 2.1.0 and classified as problematic. Affected by this issue is the function render_bin_output of the component h5dump. This manipulation causes null pointer dereference. This vulnerability is handled as CVE-2026-19023. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in HDF Group HDF5 up to 2.1.0. It has been declared as problematic. Affected by this vulnerability is the function render_bin_output of the component h5dump. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability. The summary by CVE is:

Untrusted pointer dereference in the render_bin_output function in the h5dump tool in HDF5 before 2.1.1 allows attackers to cause a denial of service via a variable-length string dataset with more than one element dumped in binary mode, which corrupts the per-element stride calculation and causes subsequent elements to be read from a misaligned offset and dereferenced as a pointer.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-19023 since 08/06/2026. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 2.1.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-53659). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.5
VulDB Meta Temp Score: 3.4

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: HDF5 2.1.1

Timelineinfo

08/05/2026 VulDB entry created
08/06/2026 +0 days Advisory disclosed
08/06/2026 +0 days CVE reserved
08/06/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-19023 (🔒)
GCVE (CVE): GCVE-0-2026-19023
GCVE (VulDB): GCVE-100-386431
EUVD: 🔒

Entryinfo

Created: 08/06/2026 00:41
Updated: 08/06/2026 04:35
Changes: 08/06/2026 00:41 (57), 08/06/2026 04:35 (1)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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