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CVE-2026-44723— Vowpal Wabbit: Shell injection via crafted PR title in python_checks.yml allows arbitrary command execution on CI runner

CVSS 5.0 · Medium EPSS 0.04% · P14

Affected Version Matrix 1

VendorProductVersion RangeStatus
VowpalWabbitvowpal_wabbit< 998e390e80a7e8192d7849b7784bc113dbd190adaffected
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I. Basic Information for CVE-2026-44723

Vulnerability Information
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Vulnerability Title
Vowpal Wabbit: Shell injection via crafted PR title in python_checks.yml allows arbitrary command execution on CI runner
Source: NVD (National Vulnerability Database)
Vulnerability Description
Vowpal Wabbit is a machine learning system. The workflow .github/workflows/python_checks.yml embeds ${{ github.event.pull_request.title }} directly inside double-quoted bash strings in four separate steps across four jobs, each passing it as a CLI argument to the Python test script run_tests_model_gen_and_load.py. The shell interprets the expanded string before invoking Python, allowing an attacker to break out of the quotes and execute arbitrary commands on the runner. The pull_request trigger fires on PRs targeting any branch (branches: ['*']), with no additional access gate. This vulnerability is fixed by the 998e390e80a7e8192d7849b7784bc113dbd190ad commit.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
Vulnerability Title
vowpal_wabbit 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
vowpal_wabbit是Vowpal Wabbit开源的一个快速在线机器学习系统。 vowpal_wabbit存在安全漏洞，该漏洞源于工作流中直接将PR标题嵌入双引号bash字符串，可能导致任意命令执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
VowpalWabbitvowpal_wabbit < 998e390e80a7e8192d7849b7784bc113dbd190ad -

II. Public POCs for CVE-2026-44723

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III. Intelligence Information for CVE-2026-44723

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Patches & Fixes for CVE-2026-44723 (1)

Vendor Advisories for CVE-2026-44723 (1)

IV. Related Vulnerabilities

Same weakness: CWE-78

V. Comments for CVE-2026-44723

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