CVE-2026-120499: Code Injection (CVSS 7.8)

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.

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CVSS v3.1 Score

7.8

HIGH

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

EPSS — Exploit Prediction

0.0042

Probability of exploitation

0.37%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-95 CWE-95

CWE-502 Deserialization of Untrusted Data

References

Other References

https://github.com/h5io/h5io/blob/h5io-0.2.5/h5io/_h5io.py#L601-L604 https://github.com/h5io/h5io/commit/afff1d61b31790f8c27e6c577bb7703eb1883ddd https://github.com/h5io/h5io/releases/tag/h5io-0.2.6 https://github.com/h5io/h5io/security/advisories/GHSA-vwvw-f6v4-w737 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

Frequently Asked Questions

What is CVE-2026-120499? +

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. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-120499? +

CVE-2026-120499 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0042, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-120499? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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