CVE-2026-120756

6.1 MEDIUMpublic exploit available

Published 2026-11-03 · Updated 2026-11-03

AI analysis for this CVE has not been generated yet. Raw NVD data is shown below.

NVD description

HDF5 through 2.2.0 contains a heap buffer over-read vulnerability in H5O__chunk_deserialize() in src/H5Ocache.c. When decoding object header messages, the declared message size is checked against the end of the chunk image before the remainder of the message header (flags, and for version 2 object headers, the optional creation index) has been decoded. Because the message body begins after these fields, a message can start up to four bytes further into the chunk than the size check accounts for. A crafted HDF5 file can declare a message size that passes the check but extends past the end of the chunk image, causing the message’s decode callback, for example H5O__mtime_new_decode() in src/H5Omtime.c, to read beyond the heap allocation. The flaw is reachable during H5Fopen() on a crafted file. An attacker who can get a user or application to open a malicious file can cause a denial of service or limited disclosure of process memory.

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

Weaknesses

CWE-125

Vendors

hdfgroup

Products

hdf5

Public exploit & PoC references

https://github.com/HDFGroup/hdf5/issues/6401[Exploit, Vendor Advisory, Issue Tracking]
https://github.com/HDFGroup/hdf5/pull/6589[Issue Tracking, Patch]

All references

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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