CVE-2026-26199

Summary

HDF5 is a high-performance library and a file format specification that implements the HDF5 data model. If H5Iget_name is invoked on a group id with 0 for the size parameter, it will underflow when trying to place a null terminator in the buffer. This can occur if H5Iget_name is invoked in a way where size can be forced to zero, and there is important data before the name buffer.

Affected Software

Weaknesses

• CWE-124: CWE-124: Buffer Underwrite ('Buffer Underflow')

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: partial

Additional References

• https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5c6x-jmgf-f5vc

References

• https://github.com/HDFGroup/hdf5/security/advisories/GHSA-5c6x-jmgf-f5vc
• https://github.com/HDFGroup/hdf5/blob/develop/src/H5Gname.c#L474

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