CVE-2026-120499

HIGH 7.8

h5io before 0.2.6 Arbitrary Code Execution via read_hdf5

CVSS Score

7.8

EPSS Score

0.0%

EPSS Percentile

0th

h5io before 0.2.6 contains a code injection vulnerability in read_hdf5() that allows attackers to execute arbitrary code by supplying a crafted HDF5 file. Attackers can store Python code in a node titled timezone, which _triage_read() passes to eval() with builtins reachable, name an arbitrary module in class or custom-object nodes that _import_class() imports, or place pickled objects in pd_dataframe or pd_series nodes that pandas deserializes on read.

CWE	CWE-95 CWE-502
Vendor	h5io
Product	h5io
Published	Nov 5, 2026
Last Updated	Nov 5, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

h5io / h5io

0.1.0 < 0.2.6

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/h5io/h5io/security/advisories/GHSA-vwvw-f6v4-w737 github.com: https://github.com/h5io/h5io/commit/afff1d61b31790f8c27e6c577bb7703eb1883ddd github.com: https://github.com/h5io/h5io/releases/tag/h5io-0.2.6 github.com: https://github.com/h5io/h5io/blob/h5io-0.2.5/h5io/_h5io.py#L601-L604 vulncheck.com: https://www.vulncheck.com/advisories/h5io-before-0.2.6-arbitrary-code-execution-via-read-hdf5

Credits

Dilanka Kaushal Hewage (r3vpwnx)