Which versions of HDF5 are affected by CVE-2025-6516?

Organizations using HDF5 should be aware of moderate risk from CVE-2025-6516, a buffer overflow vulnerability rated CVSS 5.3. Exploitation could cause memory corruption or application crashes.. A patch is available.

Is there a public PoC exploit available for CVE-2025-6516?

Yes, a public proof-of-concept exploit is available for CVE-2025-6516. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2025-6516?

Within 30 days: Identify affected systems running HDF5 and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

HDF5 CVE-2025-6516

Q: What is the CVSS score of CVE-2025-6516?

CVE-2025-6516 has a CVSS 4.0 base score of 1.9 (Low). CVSS vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.0%.

EUVD-2025-18903 LOW

Buffer Overflow (CWE-119)

2025-06-23 cna@vuldb.com

Buffer Overflow Hdf5

1.9

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

1.9 LOW

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

vuln.today AI

5.3 MEDIUM

Local attack, low privileges, low impact on all CIA.

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

4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

Ubuntu

MEDIUM

qualitative

SUSE

4.3 MEDIUM

AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Red Hat

5.3 MEDIUM

qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Lifecycle Timeline

Severity Changed

Apr 29, 2026 - 01:11 NVD

MEDIUM LOW

CVSS changed

Apr 29, 2026 - 01:11 NVD

5.3 (MEDIUM) 1.9 (LOW)

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

EUVD ID Assigned

Mar 15, 2026 - 22:10 euvd

EUVD-2025-18903

Analysis Generated

Mar 15, 2026 - 22:10 vuln.today

PoC Detected

Jun 26, 2025 - 12:25 vuln.today

Public exploit code

CVE Published

Jun 23, 2025 - 17:15 cve.org

LOW 1.9

CVE Published

Jun 23, 2025 - 17:15 nvd

MEDIUM 5.3

DescriptionCVE.org

A vulnerability has been found in HDF5 up to 1.14.6 and classified as critical. This vulnerability affects the function H5F_addr_decode_len of the file /hdf5/src/H5Fint.c. The manipulation leads to heap-based buffer overflow. An attack has to be approached locally. The exploit has been disclosed to the public and may be used.

AnalysisAI

Heap-based buffer overflow in HDF5 up to 1.14.6 allows local attackers to execute arbitrary code or cause denial of service via crafted input to the H5F_addr_decode_len function. Public exploit code exists, but no active exploitation in the wild has been confirmed. EPSS score is low (0.05%), indicating limited exploitation likelihood.

Technical ContextAI

HDF5 is a data model, library, and file format for storing and managing large amounts of data. The vulnerability is a heap-based buffer overflow (CWE-119) in the H5F_addr_decode_len function in /hdf5/src/H5Fint.c. This occurs when decoding addresses from HDF5 files, leading to memory corruption. The CPE string cpe:2.3:a:hdfgroup:hdf5:*:*:*:*:*:*:*:* indicates all versions are affected.

RemediationAI

Upgrade to the latest patched version of HDF5 beyond 1.14.6. Vendor patch is available; refer to the HDF5 GitHub repository for updates. As a workaround, restrict local access to untrusted users and avoid processing HDF5 files from untrusted sources. Red Hat users should apply RHSA-2025:23731.