CVE-2026-114134
Description
A flaw was found in the Black GitHub Action. When configured to read project settings from a configuration file, the action fails to validate the specified version identifier. A remote attacker capable of submitting a pull request can supply a reference to external malicious code, leading to arbitrary code execution within the victim repository's continuous integration (CI) workflow environment.
Déclaration
This vulnerability is rated as Important because an untrusted contributor submitting a pull request can achieve arbitrary code execution inside the build runner environment without requiring administrative privileges. Red Hat enterprise products do not distribute or execute the upstream GitHub Action, and standalone deployments of the Black formatting utility on Red Hat platforms remain unaffected by this flaw. The exposure is confined strictly to external automated continuous integration workflows configured to load version specifications dynamically from repository files.
Mesure d'atténuation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Comprendre la Défaillance (CWE)
Confidentiality,Integrity,Availability
Technical Impact: Execute Unauthorized Code or Commands
An attacker could insert malicious functionality into the program by causing the program to download code that the attacker has placed into the untrusted control sphere, such as a malicious web site. This could enable the injection of malware, information exposure by granting excessive privileges or permissions to the untrusted functionality, DOM-based XSS vulnerabilities, stealing user's cookies, open redirect to malware (CWE-601), etc.
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