CVE-2026-120499: high-severity vulnerability in h5io
h5io before 0.2.6 Arbitrary Code Execution via read_hdf5
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
18Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.5
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.
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
Affected products
h5io · h5ioReferences
https://github.com/h5io/h5io/blob/h5io-0.2.5/h5io/_h5io.py#L601-L604https://github.com/h5io/h5io/commit/afff1d61b31790f8c27e6c577bb7703eb1883dddhttps://github.com/h5io/h5io/releases/tag/h5io-0.2.6https://github.com/h5io/h5io/security/advisories/GHSA-vwvw-f6v4-w737https://www.vulncheck.com/advisories/h5io-before-0.2.6-arbitrary-code-execution-via-read-hdf5