UBUNTU-CVE-2026-120756

Dashboard / Vulnerabilities / UBUNTU-CVE-2026-120756

UBUNTU-CVE-2026-120756

Summary:

Details: 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.

References: https://ubuntu.com/security/CVE-2026-120756, https://www.cve.org/CVERecord?id=CVE-2026-120756, https://github.com/HDFGroup/hdf5/pull/6589, https://github.com/HDFGroup/hdf5/commit/10f1af5528168c5a71a58eba0b486e0677f3aaa3, https://github.com/HDFGroup/hdf5/issues/6401