HDF5 1.14.6 src/H5FL.c H5FL__reg_gc_list use after free

HistoryDiffrelatejsonxmlCTI

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
3.1	$0-$5k	0.00

Summaryinfo

A vulnerability classified as problematic was found in HDF5 1.14.6. This vulnerability affects the function H5FL__reg_gc_list of the file src/H5FL.c. The manipulation results in use after free. This vulnerability was named CVE-2025-6856. The attack needs to be approached locally. In addition, an exploit is available.

Detailsinfo

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 with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on availability.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2025-6856. The exploitability is told to be easy. The attack needs to be approached locally. Technical details and a public exploit are known.

The exploit is shared for download at github.com. It is declared as proof-of-concept.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-19481). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Database Software

Name

HDF5

Version

1.14.6

License

free

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 3.3
VulDB Meta Temp Score: 3.1

VulDB Base Score: 3.3
VulDB Temp Score: 3.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 3.3
CNA Vector: 🔒

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

06/28/2025 Advisory disclosed
06/28/2025 +0 days VulDB entry created
06/29/2025 +1 days VulDB entry last update

Sourcesinfo

Advisory: 5574
Status: Not defined

CVE: CVE-2025-6856 (🔒)
GCVE (CVE): GCVE-0-2025-6856
GCVE (VulDB): GCVE-100-314328
EUVD: 🔒
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 06/28/2025 12:48
Updated: 06/29/2025 13:24
Changes: 06/28/2025 12:48 (56), 06/29/2025 12:45 (30), 06/29/2025 13:24 (1)
Complete: 🔍
Submitter: JJLeo
Cache ID: 216:737:103

Submitinfo

Accepted

Submit #602528: HDFGroup HDF5 hdf5 1.14.6 (commit 17c16b6) Use After Free (by JJLeo)

VulDB is the best source for vulnerability data and more expert information about this specific topic.