CVE-2026-92627 Heap Use-After-Free in H5T__conv_f_f
A heap use-after-free in HDF5 allows attackers to cause crashes or potentially execute code via crafted files.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-92627?
CVE-2026-92627 is a medium-severity use after free vulnerability in The HDF Group HDF5, published on 16 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
A heap-use-after-free vulnerability exists in H5T__conv_f_f() in src/H5Tconv.c in HDF5 before 1.14.2. When converting a compound datatype containing floating-point members during a dataset read, a temporary buffer allocated with calloc() is freed and subsequently read from within the same conversion routine. An attacker who can supply a crafted HDF5 file containing a specially constructed compound datatype can trigger the use-after-free when the file is parsed by an application that reads the affected dataset, such as h5dump. This can result in a crash and, depending on heap layout and allocator behavior, may be exploitable for further memory corruption up to remote code execution.
Weakness: CWE-416
Which versions are affected by CVE-2026-92627?
How do I fix CVE-2026-92627?
Upgrade to a fixed version.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-92627 being exploited?
There is no known exploitation of CVE-2026-92627 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-92627, ECHO-8d08-566a-3802, GHSA-q9w4-8jx2-6xc8, UBUNTU-CVE-2026-92627.