Vulnerability · Published Jun 28, 2025 · Assigned by VulDB

CVE-2025-6816HDF5 H5Ofsinfo.c H5O__fsinfo_encode heap-based overflow

Low 3.3

In plain English

A low-severity heap buffer overflow in HDF5. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)3.3Low

Exploit odds (30 days)0.3%top 82.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

A vulnerability classified as problematic was found in HDF5 1.14.6. This vulnerability affects the function H5O__fsinfo_encode of the file /src/H5Ofsinfo.c. The manipulation leads to heap-based buffer overflow. It is possible to launch the attack on the local host. The exploit has been disclosed to the public and may be used.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	hdf5	no fix listed	DEBIAN-CVE-2025-6816
Debian:13	hdf5	no fix listed	DEBIAN-CVE-2025-6816
Debian:14	hdf5	2.1.0+repack-1	DEBIAN-CVE-2025-6816
Ubuntu:22.04:LTS	hdf5	no fix listed	UBUNTU-CVE-2025-6816
Ubuntu:24.04:LTS	hdf5	no fix listed	UBUNTU-CVE-2025-6816
Ubuntu:25.10	hdf5	no fix listed	UBUNTU-CVE-2025-6816
Ubuntu:26.04:LTS	hdf5	no fix listed	UBUNTU-CVE-2025-6816
Ubuntu:26.10	hdf5	no fix listed	UBUNTU-CVE-2025-6816

Affected products (as reported)

Vendor	Product	Versions
n/a	HDF5	1.14.6

Weakness: CWE-122, CWE-119 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R

References

VDB-314254 | HDF5 H5Ofsinfo.c H5O__fsinfo_encode heap-based overflow vdb-entry, technical-description
VDB-314254 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
Submit #602291 | HDFGroup HDF5 hdf5 1.14.6 (commit 17c16b6) Heap-based Buffer Overflow third-party-advisory
https://github.com/HDFGroup/hdf5/issues/5571 issue-tracking
https://github.com/user-attachments/files/20623354/hdf5_crash_3.txt exploit