CVE-2026-120499

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{"bugzilla": {"description": "h5io: h5io: Arbitrary code execution via crafted HDF5 file", "id": "2567484", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2567484"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-94", "details": ["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."], "mitigation": {"lang": "en:us", "value": "Do not load or process HDF5 files from untrusted or unverified external sources.\nIf processing untrusted datasets is required, execute workloads within an isolated container or restricted sandbox running under an unprivileged user account with minimal access to local storage and network resources.\nCaveat: Sandboxing or container isolation mitigates lateral movement and host compromise but does not prevent malicious code execution within the isolated container boundary itself."}, "name": "CVE-2026-120499", "public_date": "2026-11-05T16:55:32Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-120499\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-120499\nhttps://github.com/h5io/h5io/blob/h5io-0.2.5/h5io/_h5io.py#L601-L604\nhttps://github.com/h5io/h5io/commit/afff1d61b31790f8c27e6c577bb7703eb1883ddd\nhttps://github.com/h5io/h5io/releases/tag/h5io-0.2.6\nhttps://github.com/h5io/h5io/security/advisories/GHSA-vwvw-f6v4-w737\nhttps://www.vulncheck.com/advisories/h5io-before-0.2.6-arbitrary-code-execution-via-read-hdf5"], "statement": "Red Hat rates this vulnerability as Important severity because an attacker can achieve arbitrary execution within the process context without prior privileges, although exploitation requires local interaction to load malicious data. The affected library is not part of default system installations and is typically utilized within standalone data-processing environments rather than persistently exposed daemons. As a result, the risk is confined to individual workloads or user accounts that ingest datasets originating from unverified external sources.", "threat_severity": "Important"}

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