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TI-2026-32610 Aliases CVE-2026-44723

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

Priority HIGH 76CWE-1336Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-1336.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00469 40th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed vowpal_wabbit (VowpalWabbit): 998e390e80a7e8192d7849b7784bc113dbd190ad

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
VowpalWabbitvowpal_wabbitbefore 998e390e80a7e8192d7849b7784bc113dbd190ad998e390e80a7e8192d7849b7784bc113dbd190adPatch availableCNA
  • vowpal_wabbit VendorVowpalWabbit Affected before 998e390e80a7e8192d7849b7784bc113dbd190ad Fixed in 998e390e80a7e8192d7849b7784bc113dbd190ad Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:vowpalwabbit:vowpal_wabbit:*:*:*:*:*:*:*:*before 2026-05-04VulnerableVowpalWabbit
  • cpe:2.3:a:vowpalwabbit:vowpal_wabbit:*:*:*:*:*:*:*:* Versions before 2026-05-04 Vulnerable ·VowpalWabbit

Remediation

  • Fix · CNA vowpal_wabbit (VowpalWabbit) Fixed in 998e390e80a7e8192d7849b7784bc113dbd190ad

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-44723

References

Exploit 1

Patch 1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences