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CVE-2025-6516· NVD / CVE Program· CNA VulDB

HDF5 H5Fint.c H5F_addr_decode_len heap-based overflow

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.

LowCVSS 1.9 · v4.0—No exploit Fix available

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Published
Jun 23, 2025
Updated
Jun 17, 2026
EPSS
0.4% · 29th percentile
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Report tools

JSON

Action score

7

Monitor

Low priority for now.

CVSS
7 / 40 · 1.9 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
proof of concept
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · VulDB
4.8
NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
hdfgrouphdf5

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • hdfgroup hdf5up to 1.14.6 inclusive

Versions reported by the vendor

Affected version ranges reported by the assigning authority (VulDB). Independent of NVD's CPE analysis and usually ahead of it.

  • n/a HDF5

    • 1.14.0, 1.14.1, 1.14.2, 1.14.3, 1.14.4, 1.14.5, 1.14.6affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12hdf5all versions—
Debian:14hdf5before 2.1.0+repack-12.1.0+repack-1
Red Hat:enterprise_linux_ai:3.0::el9hdf5before 0:1.14.6-6.el9ai0:1.14.6-6.el9ai
Red Hat:enterprise_linux_ai:3.0::el9hdf5-debuginfobefore 0:1.14.6-6.el9ai0:1.14.6-6.el9ai
Red Hat:enterprise_linux_ai:3.0::el9hdf5-debugsourcebefore 0:1.14.6-6.el9ai0:1.14.6-6.el9ai
Red Hat:enterprise_linux_ai:3.0::el9hdf5-develbefore 0:1.14.6-6.el9ai0:1.14.6-6.el9ai
Red Hat:enterprise_linux_ai:3.0::el9hdf5-openmpibefore 0:1.14.6-6.el9ai0:1.14.6-6.el9ai
Red Hat:enterprise_linux_ai:3.0::el9hdf5-openmpi-debuginfobefore 0:1.14.6-6.el9ai0:1.14.6-6.el9ai
Red Hat:enterprise_linux_ai:3.0::el9hdf5-openmpi-develbefore 0:1.14.6-6.el9ai0:1.14.6-6.el9ai
Red Hat:enterprise_linux_ai:3.0::el9hdf5-openmpi-staticbefore 0:1.14.6-6.el9ai0:1.14.6-6.el9ai
Red Hat:enterprise_linux_ai:3.0::el9hdf5-staticbefore 0:1.14.6-6.el9ai0:1.14.6-6.el9ai

Same product

hdfgroup: all records

Other highest-scoring records for the same primary product.

  • CVE-2018-13876An issue was discovered in the HDF HDF5 1.8.20 library.
    40Plan
  • CVE-2018-13874An issue was discovered in the HDF HDF5 1.8.20 library.
    40Plan
  • CVE-2018-13873An issue was discovered in the HDF HDF5 1.8.20 library.
    40Plan
  • CVE-2018-13872An issue was discovered in the HDF HDF5 1.8.20 library.
    40Plan
  • CVE-2018-13871An issue was discovered in the HDF HDF5 1.8.20 library.
    40Plan
  • CVE-2018-13870An issue was discovered in the HDF HDF5 1.8.20 library.
    40Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:hdf52.1.0+repack-1 · Debian:14Package registry (OSV)
red hat:hdf50:1.14.6-6.el9ai · Red Hat:enterprise_linux_ai:3.0::el9Package registry (OSV)
red hat:hdf5-debuginfo0:1.14.6-6.el9ai · Red Hat:enterprise_linux_ai:3.0::el9Package registry (OSV)
red hat:hdf5-debugsource0:1.14.6-6.el9ai · Red Hat:enterprise_linux_ai:3.0::el9Package registry (OSV)
red hat:hdf5-devel0:1.14.6-6.el9ai · Red Hat:enterprise_linux_ai:3.0::el9Package registry (OSV)
red hat:hdf5-openmpi0:1.14.6-6.el9ai · Red Hat:enterprise_linux_ai:3.0::el9Package registry (OSV)
red hat:hdf5-openmpi-debuginfo0:1.14.6-6.el9ai · Red Hat:enterprise_linux_ai:3.0::el9Package registry (OSV)
red hat:hdf5-openmpi-devel0:1.14.6-6.el9ai · Red Hat:enterprise_linux_ai:3.0::el9Package registry (OSV)
red hat:hdf5-openmpi-static0:1.14.6-6.el9ai · Red Hat:enterprise_linux_ai:3.0::el9Package registry (OSV)
red hat:hdf5-static0:1.14.6-6.el9ai · Red Hat:enterprise_linux_ai:3.0::el9Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2025-2308101 days apartHDF5 Scale-Offset Filter H5Z__scaleoffset_decompress_one_byte heap-based overflow
    19Monitor
  • CVE-2025-2309101 days apartHDF5 Type Conversion Logic H5T__bit_copy heap-based overflow
    19Monitor
  • CVE-2025-2310101 days apartHDF5 Metadata Attribute Decoder H5MM_strndup heap-based overflow
    19Monitor
  • CVE-2025-2153105 days apartHDF5 h5 File H5SM.c H5SM_delete heap-based overflow
    9Monitor
  • CVE-2025-67503 days apartHDF5 H5Omtime.c H5O__mtime_new_encode heap-based overflow
    7Monitor
  • CVE-2025-62704 days apartHDF5 H5FSsection.c H5FS__sect_find_node heap-based overflow
    7Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
X

Weakness class (CWE)

CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records