Is there a public exploit for CVE-2026-120499?

No public exploit for CVE-2026-120499 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-120499?

CVE-2026-120499 scores CVSS 8.5 (v4.0), rated high.

What does CVE-2026-120499 affect?

CVE-2026-120499 affects h5io h5io.

8.5 High

h5io before 0.2.6 contains a code injection vulnerability in readhdf5() that allows attackers to execute arbitrary code by supplying a…

CVE-2026-120499

h5io before 0.2.6 contains a code injection vulnerability in readhdf5() that allows attackers to execute arbitrary code by supplying a crafted HDF5 file. Attackers can store Python code in a node titled timezone, which triageread() passes to eval() with builtins reachable, name an arbitrary module in class or custom-object nodes that importclass() imports, or place pickled objects in pddataframe or pdseries nodes that pandas deserializes on read.

Assessment

CVSS: 8.5 (v4.0)
Severity: High
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 5 November 2026
Last updated: 5 November 2026
Affected: h5io · h5io
Assigner: VulnCheck

CVSS vectorCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

At the source

EUVD (ENISA)

References

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