HDF Group HDF5 up to 2.3.0 Chunk Layout Validation H5Olayout.c H5O__layout_decode divide by zero

Summaryinfo

A vulnerability identified as problematic has been detected in HDF Group HDF5 up to 2.3.0. The impacted element is the function H5O__layout_decode of the file H5Olayout.c of the component Chunk Layout Validation. This manipulation causes divide by zero. This vulnerability is tracked as CVE-2026-19025. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in HDF Group HDF5 up to 2.3.0 and classified as problematic. Affected by this vulnerability is the function H5O__layout_decode of the file H5Olayout.c of the component Chunk Layout Validation. The manipulation with an unknown input leads to a divide by zero vulnerability. The CWE definition for the vulnerability is CWE-369. The product divides a value by zero. As an impact it is known to affect availability. The summary by CVE is:

H5O__layout_decode in H5Olayout.c in HDF5 through 2.3.0 does not validate that a chunked dataset's stored chunk-layout dimensionality matches its dataspace rank when an existing dataset is opened, whereas this check is performed only at dataset-creation time. This allows attackers to cause a denial of service (divide-by-zero and application crash in H5S__hyper_iter_get_seq_list in src/H5Shyper.c) via a crafted HDF5 file with mismatched chunk/dataspace ranks that is opened and read via H5Dopen2 and H5Dread, e.g. by the h5repack tool.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-19025 since 08/06/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

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 EUVD (EUVD-2026-53686). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Database Software

Vendor

• HDF Group

Name

• HDF5

Version

• 2.0
• 2.1
• 2.2
• 2.3.0

License

• free

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Discussion