hdf5 v1.14.6 was discovered to contain a heap buffer overflow via the H5VM_memcpyvv function.

published 2025-05-30 17 mo ago modified 2026-07-25 3 mo ago also EUVD-2025-16461 , JLSEC-2026-337

cvss: 8.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 39%
public exploits: 0; none known

Patch / fix

fixed in 1 distros 1

julia HDF5_jll 2.0.0+0

hdf5 Azure Linux 3.0 1.14.6-3

azure linux advisories AZL-72392

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-44904 updated 2026-06-28 cvss 5.9

hdf5: Heap Buffer Overflow in HDF5 H5VM_memcpyvv Function

Red Hat Enterprise Linux AI (RHEL AI) hdf5
affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: total
Assessed: 17 mo ago (2025-05-30)

Exploit prediction

0.46% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/madao123123/crash_report/blob/main/hdf5_poc/hdf5_poc1.md referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
OSV	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
julia	HDF5_jll	>=1.14.5+0, <2.0.0+0	2.0.0+0

Classification

Weakness

CWE-122 Heap-based Buffer Overflow

References

github.com /madao123123/crash_report/blob/main/hdf5_poc/hdf5_poc1.md
exploit, third-party-advisory, web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary