CVE-2025-6856

Name: CVE-2025-6856
Creator: NVD / NIST
Published: 2025-06-29T10:15:21.443+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

LOWCVSS 1.9/10EPSS 0.20%

Last modified Jun 17, 2026

CVE-2025-6856 is a low-severity vulnerability rated 1.9/10 on the CVSS scale. A vulnerability, which was classified as problematic, was found in HDF5 1.14.6. Affected is the function H5FL__reg_gc_list of the file src/H5FL.c. EPSS estimates a 0.20% chance of exploitation in the next 30 days.

Description

A vulnerability, which was classified as problematic, was found in HDF5 1.14.6. Affected is the function H5FL__reg_gc_list of the file src/H5FL.c. The manipulation leads to use after free. Attacking locally is a requirement. The exploit has been disclosed to the public and may be used.

Metrics

CVSS 3.1

7.8/10

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

CVSS 4.0

1.9/10

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/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 Probability

0.20%

9.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Hdfgroup	Hdf5	1.14.6

References

https://github.com/HDFGroup/hdf5/issues/5574Exploit, Issue Tracking, Third Party Advisory
https://github.com/user-attachments/files/20623417/hdf5_crash_6.txtExploit
https://vuldb.com/?ctiid.314328Permissions Required
https://vuldb.com/?id.314328Third Party Advisory, VDB Entry
https://vuldb.com/?submit.602528Third Party Advisory, VDB Entry

Timeline

Published: Jun 29, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-6856?

How severe is CVE-2025-6856?

CVE-2025-6856 has a CVSS score of 1.9/10 (LOW severity). The EPSS model estimates a 0.20% probability of exploitation in the next 30 days.

How do I fix CVE-2025-6856?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-6856?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST