{"id":"CVE-2026-120499","title":"h5io before 0.2.6 Arbitrary Code Execution via read_hdf5","summary":"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() pa…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-95","CWE-502"],"vendor":"h5io","product":"h5io","affected":["h5io >= 0.1.0 < 0.2.6"],"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"total","timestamp":"2026-11-05T18:30:02.460697Z"},"exploitAvailable":true,"published":"2026-11-05","updated":"2026-11-05","sourceUpdated":"2026-11-05T18:30:58.290Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-120499","references":[{"url":"https://github.com/h5io/h5io/security/advisories/GHSA-vwvw-f6v4-w737","label":"GitHub Security Advisory (GHSA-vwvw-f6v4-w737)"},{"url":"https://github.com/h5io/h5io/commit/afff1d61b31790f8c27e6c577bb7703eb1883ddd"},{"url":"https://github.com/h5io/h5io/releases/tag/h5io-0.2.6","label":"h5io h5io-0.2.6 Release Notes"},{"url":"https://github.com/h5io/h5io/blob/h5io-0.2.5/h5io/_h5io.py#L601-L604"},{"url":"https://www.vulncheck.com/advisories/h5io-before-0.2.6-arbitrary-code-execution-via-read-hdf5","label":"VulnCheck Advisory: h5io before 0.2.6 Arbitrary Code Execution via read_hdf5"}],"tags":["cve.org","exploit-available"],"ingestedAt":"2026-11-05T22:38:31.470Z","slug":"CVE-2026-120499","body":"## Overview\n\nh5io 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.\n\n## Affected\n\n- `h5io >= 0.1.0 < 0.2.6`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":55,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[]}