CVE-2026-19028 - HDF5 integer underflow in Fletcher32 filter leads to massive out-of-bounds read

CVE-2026-19028 - HDF5 integer underflow in Fletcher32 filter leads to massive out-of-bounds read

https://cvefeed.io/rssfeed/latest.atom / Thu, 08/06/2026 - 07:09
CVE ID :CVE-2026-19028
Published : Aug. 6, 2026, 12:16 a.m. | 4 hours, 52 minutes ago
Description :H5Z__filter_fletcher32 in H5Zfletcher32.c in HDF5 through 2.3.0 computes the data length to checksum by subtracting the 4-byte trailing checksum size from the input buffer size without checking that the buffer is at least 4 bytes, allowing a size_t underflow. This allows attackers to cause a denial of service (massively out-of-bounds read and application crash in H5_checksum_fletcher32) via a crafted HDF5 file with a Fletcher32-filtered chunk smaller than 4 bytes, triggered via H5Dread, e.g. by the h5ls or h5dump tools.
Severity: 6.8 | MEDIUM
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