CVE-2026-19028 (GCVE-0-2026-19028)

Vulnerability from cvelistv5 – Published: 2026-08-05 23:15 – Updated: 2026-10-06 20:32
VLAI
Title
HDF5 integer underflow in Fletcher32 filter leads to massive out-of-bounds read
Summary
H5Z__filter_fletcher32 in H5Zfletcher32.c in HDF5 prior to 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)
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-06 14:24 UTC
CWE
  • CWE-190 - Integer overflow or wraparound
  • CWE-125 - Out-of-bounds read
  • CWE-1284 - Improper validation of specified quantity in input
Assigner
HDFG CNA under the redhat root
CNA scorecard C 71/100 over 12 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
The HDF Group HDF5 Affected: <=2.3.0
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

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