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CVE-2026-120499h5io 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.
8.5 HIGHEPSS 0.42%Not in KEVNVD: Received
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 8.5 | HIGH | 4.0VulnCheck (CNA) | 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 |
| 7.8 | HIGH | 3.1VulnCheck (CNA) | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
Details
- CVE ID
- CVE-2026-120499
- Status
- Received
- Assigner (CNA)
- VulnCheck
- Published
- Nov 5, 2026
- Last modified
- 2026-11-05 19:17 UTC
Affected Products
As published by the CNA in the CVE record.
h5ioh5io1 version range
- 0.1.0 before 0.2.6
References
- github.com https://github.com/h5io/h5io/blob/h5io-0.2.5/h5io/_h5io.py#L601-L604
- 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/security/advisories/GHSA-vwvw-f6v4-w737
- vulncheck.com https://www.vulncheck.com/advisories/h5io-before-0.2.6-arbitrary-code-execution-via-read-hdf5