CVE-2025-6857Public exploit

Process crash via unbounded B-tree recursion

Published Jun 29, 2025 · Updated Jun 30, 2025

Stack overflow in HDF5 1.14.6 allows local users to crash a process by supplying a crafted HDF5 file for parsing. Processing the proof-of-concept file sends H5B_find through unbounded recursive B-tree lookup, exhausting the stack when execution reaches H5G__node_cmp3. The attacker needs local execution access and control over a file parsed by an HDF5-consuming process; the demonstrated consequence is process termination.

CVSS severity7.8
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack overflow in HDF5 1.14.6 allows local users to crash a process by supplying a crafted HDF5 file for parsing. Processing the proof-of-concept file sends H5B_find through unbounded recursive B-tree lookup, exhausting the stack when execution reaches H5G__node_cmp3. The attacker needs local execution access and control over a file parsed by an HDF5-consuming process; the demonstrated consequence is process termination.

The record

CVE
CVE-2025-6857
Published
Jun 29, 2025
Updated
Jun 30, 2025
Vendor
The HDF Group
Product
HDF5
Classifications
CWE-119, CWE-121
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 30, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.14.6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The HDF Group · HDF5version=1.14.6

Published CVSS scores

3.3VulDBCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R
1.7VulDBAV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:ND/RC:UR
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
1.9VulDBCVSS: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
3.3VulDBCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-119Memory Corruption
CWE-121Stack-based Buffer Overflow

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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