HDF Group HDF5 up to 2.2.x Szip Filter src/H5Zszip.c H5Z__filter_szip out-of-bounds

Summaryinfo

A vulnerability described as problematic has been identified in HDF Group HDF5 up to 2.2.x. Affected by this vulnerability is the function H5Z__filter_szip of the file src/H5Zszip.c of the component Szip Filter. The manipulation results in out-of-bounds. This vulnerability is identified as CVE-2026-120755. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in HDF Group HDF5 up to 2.2.x. It has been classified as problematic. Affected is the function H5Z__filter_szip of the file src/H5Zszip.c of the component Szip Filter. The manipulation with an unknown input leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. This is going to have an impact on availability. CVE summarizes:

HDF5 through 2.2.0 contains an out-of-bounds read vulnerability in H5Z__filter_szip() in src/H5Zszip.c. When decoding a szip-compressed chunk, the function subtracts the 4-byte uncompressed-length header from the chunk length without first verifying that the chunk is at least 4 bytes long. A truncated or corrupted chunk shorter than the header causes the length calculation to wrap around to a very large value, and the decompressor reads far past the end of the chunk buffer. An attacker who can get a user or application to read a dataset from a crafted HDF5 file can cause a denial of service. Only builds with szip support (libaec or the szip library) are affected.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-120755 since 11/02/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit.

It is declared as proof-of-concept.

Upgrading to version 2.3.0 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Database Software

Vendor

• HDF Group

Name

• HDF5

Version

• 2.0
• 2.1
• 2.2

License

• free

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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