How severe is GHSA-vwvw-f6v4-w737?

No CVSS score has been assigned to GHSA-vwvw-f6v4-w737 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-vwvw-f6v4-w737?

Affected package information for GHSA-vwvw-f6v4-w737 is not yet fully mapped. Check the official advisory links for details.

How do I fix GHSA-vwvw-f6v4-w737?

Upgrade the affected component to the fixed release for GHSA-vwvw-f6v4-w737, or apply your distribution's backported patch — distro builds are often patched at an older version number, so check your vendor's advisory rather than the upstream version alone.

How do I detect GHSA-vwvw-f6v4-w737 in my code and dependencies?

Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).

How do I mitigate GHSA-vwvw-f6v4-w737 if there is no patch (or I can't update yet)?

Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.

Is GHSA-vwvw-f6v4-w737 actively exploited in the wild?

No public exploit code has been indexed for GHSA-vwvw-f6v4-w737 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for GHSA-vwvw-f6v4-w737?

GHSA-vwvw-f6v4-w737 has an EPSS (Exploit Prediction Scoring System) score of 0.4%, placing it in the 37th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is GHSA-vwvw-f6v4-w737?

GHSA-vwvw-f6v4-w737 is classified as CWE-95 (CWE-95), Deserialization of Untrusted Data (CWE-502). These weakness types describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was GHSA-vwvw-f6v4-w737 published, and has it been updated?

GHSA-vwvw-f6v4-w737 was published on November 5, 2026 and was last updated on November 6, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

h5io before 0.2.6 Arbitrary Code Execution via read

Exploitation Status

Proof-of-concept exploit code exists

CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
A successful exploit gives an attacker total control of the affected component, not partial access.

Exploitation and automatability from CISA’s SSVC triage for GHSA-vwvw-f6v4-w737.

EPSS Exploitation Probability

via FIRST.org ↗

0.4%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs37th percentile — riskier than 37% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

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.

Detection & mitigation playbook

Vulnerability

Detect
Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).
Fix
Upgrade the affected component to the fixed release for GHSA-vwvw-f6v4-w737, or apply your distribution's backported patch — distro builds are often patched at an older version number, so check your vendor's advisory rather than the upstream version alone.
Workarounds
Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatImportant

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…

Workaround published by Red Hat

Do not load or process HDF5 files from untrusted or unverified external sources. If 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. Caveat: Sandboxing or container isolation mitigates lateral movement and host compromise but does not prevent malicious code execution within the isolated container boundary itself. --- CME Mitigation Guidance (2026-11-06) --- Disclaimer: The following mitigation solutions are provided as a courtesy, pending the application of an official patch. This content was generated utilizing AI tools in…

Source: Red Hat security advisory for GHSA-vwvw-f6v4-w737 (CC BY 4.0)

Frequently Asked Questions

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.

O3 Security · Impact-Aware SCA

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h5io before 0.2.6 Arbitrary Code Execution via read_hdf5GHSA-vwvw-f6v4-w737