CVE-2026-19029: HDF5 scale-offset filter heap buffer over-read via crafted chunk

Vulnerability summary

CVE-2026-19029 is a medium (CVSS 6.8) Out-of-bounds Read vulnerability in the hdf group hdf5. EPSS estimates a 0.12% chance of exploitation in the next 30 days, higher than 1.7% of scored vulnerabilities.

Timeline

1. 06-10-2026
   PublishedVulnerability first disclosed.
2. 07-10-2026
   Last modifiedVulnerability information updated.

Description

A heap-based buffer over-read in H5Z__filter_scaleoffset() in src/H5Zscaleoffset.c in HDF5 through 2.2.0 lets an attacker cause a denial of service (application crash) with a crafted HDF5 file. When the stored minimum bits equal the full precision of the datatype, the decoder copies d_nelmts * size bytes from the compressed chunk without checking that the chunk holds that many bytes. Both values come from attacker-controlled scale-offset filter parameters in the dataset's filter pipeline message.

• CWE-125Out-of-bounds ReadThe product reads data past the end, or before the beginning, of the intended buffer.