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CVE-2026-68939— Pyenv: Glob/wildcard metacharacters bypass is_version_safe(), causing silent version/interpreter substitution via unquoted expansion (CVE-2022-35861 residual)

Quick assessment

Affected
pyenv pyenv
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.

pyenv 提供简单的 Python 版本管理功能。在版本 2.8.0 之前， 中的 函数会接受 文件中包含的 shell 通配元字符；同时， 、 、 、 、 、 和 中未加引号的 扩展会对当前目录进行路径名扩展（pathname expansion）。这使得攻击者可以通过在本地目录放置一个匹配的文件，静默地强制选择一个不同的已安装 Python 解释器或版本。该问题已在版本 2.8.0 中修复。

CVSS 2.0 · Low EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1059.004 · Unix Shell

Affected Version Matrix 1

VendorProduct Version RangeStatus
pyenv pyenv < 2.8.0 affected
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I. Basic Information for CVE-2026-68939

Vulnerability Information
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Vulnerability Title
Pyenv: Glob/wildcard metacharacters bypass is_version_safe(), causing silent version/interpreter substitution via unquoted expansion (CVE-2022-35861 residual)
Source: CVE Program / CVE List V5
Vulnerability Description
Pyenv provides simple Python version management. Prior to 2.8.0, is_version_safe() in libexec/pyenv-version-file-read accepts shell glob metacharacters in .python-version values, and unquoted PYENV_VERSION expansion in libexec/pyenv-version-name, libexec/pyenv-which, libexec/pyenv-prefix, libexec/pyenv-local, libexec/pyenv-global, libexec/pyenv-version, and libexec/pyenv-versions pathname-expands the value against the current directory, allowing a matching attacker-controlled file to silently select a different installed interpreter or version. This issue is fixed in version 2.8.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
pyenv pyenv < 2.8.0 -

II. Public POCs for CVE-2026-68939

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III. Intelligence Information for CVE-2026-68939

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Patches & Fixes for CVE-2026-68939 (1)

Vendor Advisories for CVE-2026-68939 (1)

Vendor Pages for CVE-2026-68939 (1)

IV. Related Vulnerabilities

Same weakness: CWE-78

V. Comments for CVE-2026-68939

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