Bug 2567484 (CVE-2026-120499)

Summary: CVE-2026-120499 h5io: h5io: Arbitrary code execution via crafted HDF5 file
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in h5io. This vulnerability allows an attacker to execute arbitrary code by convincing a user to process a specially crafted Hierarchical Data Format (HDF5) file. During file parsing in the read_hdf5 function, unsafe evaluation and deserialization of embedded objects enables unauthorized code execution with the permissions of the application user.
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Description OSIDB Bzimport 2026-11-05 22:01:39 UTC 
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.