Use After Free Vulnerability in HDF5 Software by HDF Group
CVE-2025-6856

4.8MEDIUM

Key Information:

Vendor

HDF Group

Status
Hdf5
Vendor
CVE Published:
29 June 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-6856?

A vulnerability has been identified in HDF5 version 1.14.6 related to the H5FL__reg_gc_list function in the source file src/H5FL.c. This vulnerability manifests as a use after free condition, which necessitates local access for exploitation. Although details regarding this security flaw have been made public, it underscores the importance of applying security patches promptly to mitigate potential risks associated with malicious exploitation.

Affected Version(s)

HDF5 1.14.6

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2025-6856 - Proof of Concept

References

https://vuldb.com/?id.314328
vdb-entrytechnical-description
https://vuldb.com/?ctiid.314328
signaturepermissions-required
https://vuldb.com/?submit.602528
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

JJLeo (VulDB User)
.
CVE-2025-6856 : Use After Free Vulnerability in HDF5 Software by HDF Group