CVE-2026-19024Public exploit

Process crash via malformed fill value metadata

Published Aug 5, 2026 · Updated Aug 5, 2026

NULL pointer dereference in HDF5 2.1.1 and earlier allows attackers to crash a process that parses crafted datasets. H5Pget_fill_value fails to normalize a negative size in a defined version 1 or 2 fill value message, so H5T_path_find receives a NULL datatype. Exploitation requires an application to parse attacker-controlled HDF5 data and interrupts only the affected process.

CVSS severity8.2
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in HDF5 2.1.1 and earlier allows attackers to crash a process that parses crafted datasets. H5Pget_fill_value fails to normalize a negative size in a defined version 1 or 2 fill value message, so H5T_path_find receives a NULL datatype. Exploitation requires an application to parse attacker-controlled HDF5 data and interrupts only the affected process.

The record

CVE
CVE-2026-19024
Published
Aug 5, 2026
Updated
Aug 5, 2026
Vendor
The HDF Group
Product
HDF5
Classifications
CWE-476
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record 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=<= 2.1.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The HDF Group · HDF5version=<= 2.1.1

Published CVSS scores

8.2The HDF GroupCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-476NULL Pointer Dereference

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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