CVE-2026-120499
h5io before 0.2.6 Arbitrary Code Execution via read_hdf5
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.
Fixes and workarounds
Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: VulnCheckAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| h5io h5io h5io
pypi |
≥ 0.1.0; < 0.2.6 (affected, semver)
Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 8.5 high |
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 | CNA: VulnCheck |
| 3.1 / 7.8 high |
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H | CNA: VulnCheck |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/h5io/h5io/security/advisories/GHSA-vwvw-f6v4-w737CNA: VulnCheck · vendor-advisory
- https://github.com/h5io/h5io/commit/afff1d61b31790f8c27e6c577bb7703eb1883dddCNA: VulnCheck · patch
- https://github.com/h5io/h5io/releases/tag/h5io-0.2.6CNA: VulnCheck · release-notes
- https://github.com/h5io/h5io/blob/h5io-0.2.5/h5io/_h5io.py#L601-L604CNA: VulnCheck · technical-description
- https://www.vulncheck.com/advisories/h5io-before-0.2.6-arbitrary-code-execution-via-read-hdf5CNA: VulnCheck · third-party-advisory
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