CVE-2026-34734: HDF5: H5T__conv_struct Use After Free
HDF5 is software for managing data. In 1.14.1-2 and earlier, a heap-use-after-free was found in the h5dump helper utility. An attacker who can supply a malicious h5 file can trigger a heap use-after-free. The freed object is referenced in a memmove call from H5Tconvstruct. The original object was allocated by H5Dtypeinfoinitphase3 and freed by H5Dtypeinfoterm.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-34734?
CVE-2026-34734 has a high severity due to the potential for a heap-use-after-free vulnerability that could be exploited by attackers.
How do I fix CVE-2026-34734?
To fix CVE-2026-34734, upgrade to HDF5 version 1.14.2 or later that addresses the heap-use-after-free issue.
What software is affected by CVE-2026-34734?
CVE-2026-34734 affects HDF5 versions 1.14.1-2 and earlier.
What type of vulnerability is CVE-2026-34734?
CVE-2026-34734 is a heap-use-after-free vulnerability found in the h5dump utility of HDF5.
Can CVE-2026-34734 be exploited remotely?
Yes, an attacker who can supply a malicious h5 file can exploit CVE-2026-34734 remotely.