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CVE-2026-17573

Double Free in H5D__chunk_copy() in HDF5 via a Crafted Chunk-Index Size Field

MEDIUM
5.5
CVSS Score
Published: July 27, 2026 at 03:11 PM UTC
Updated: October 24, 2026 at 01:10 PM UTC
2 products affected across 2 vendorsHDF5HDF5

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.2%
SSVC
PoC

Description

A double free vulnerability was discovered in the HDF5 library. Processing a crafted HDF5 file containing an oversized chunk size field via h5repack may cause the application to abort due to a double free.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

HDF5· Hdfgroup
95%
v < 2.2.0
Affected range stops below 2.2.0, so it looks safe — our inference, not a vendor statement
HDF5· Hdf
90%
<= 2.1.1

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

ExploitIssue TrackingThird Party Advisory
Source: cverecord
https://github.com/HDFGroup/hdf5/issues/6124

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.5MEDIUM[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-415

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