CVE-2026-120499— h5io before 0.2.6 Arbitrary Code Execution via read_hdf5

Quick assessment

Affected

h5io h5io

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在版本 0.2.6 之前的 h5io 中，函数存在代码注入漏洞。攻击者可通过提供特制的 HDF5 文件来执行任意代码。具体攻击方式包括：将 Python 代码存储在名为的节点中，该节点会被函数传递给执行（此时内置函数可被访问）；在或节点中指定任意模块名称，由函数导入；或在或节点中放置已序列化的（pickled）对象，这些对象会在读取时被 pandas 反序列化。

CVSS 7.8 · High Updated Nov 06, 2026

Possible ATT&CK Techniques 2 AI

T1059.006 · Python T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

Vendor	Product	Version Range	Status
h5io	h5io	`0.1.0< 0.2.6`	affected

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Vulnerability Information

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Vulnerability Title

h5io before 0.2.6 Arbitrary Code Execution via read_hdf5

Source: CVE Program / CVE List V5

Vulnerability 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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

动态执行代码中指令转义处理不恰当(Eval注入)

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
h5io	h5io	0.1.0 ~ 0.2.6	-

II. Public POCs for CVE-2026-120499

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-120499

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Other References for CVE-2026-120499 (5)

https://github.com/h5io/h5io/commit/afff1d61b31790f8c27e6c577bb7703eb1883ddd patch
https://github.com/h5io/h5io/blob/h5io-0.2.5/h5io/_h5io.py#L601-L604 technical-description
https://github.com/h5io/h5io/releases/tag/h5io-0.2.6 release-notes
https://github.com/h5io/h5io/security/advisories/GHSA-vwvw-f6v4-w737 vendor-advisory
https://www.vulncheck.com/advisories/h5io-before-0.2.6-arbitrary-code-execution-via-read-hdf5 third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-120499

IV. Related Vulnerabilities

Same weakness: CWE-95