CVE-2026-120499

high

Description

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.

References

https://www.vulncheck.com/advisories/h5io-before-0.2.6-arbitrary-code-execution-via-read-hdf5

https://github.com/h5io/h5io/security/advisories/GHSA-vwvw-f6v4-w737

https://github.com/h5io/h5io/releases/tag/h5io-0.2.6

https://github.com/h5io/h5io/commit/afff1d61b31790f8c27e6c577bb7703eb1883ddd

https://github.com/h5io/h5io/blob/h5io-0.2.5/h5io/_h5io.py#L601-L604

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-117602

Details

Source: Mitre, NVD

Published: 2026-11-05

Updated: 2026-11-05

Risk Information

CVSS v2

Base Score: 7.2

Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C

Severity: High

CVSS v3

Base Score: 7.8

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

Severity: High

CVSS v4

Base Score: 8.5

Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Severity: High

EPSS

EPSS: 0.00423