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Security Advisories: GSA_kwCzR0hTQS02cTRtLTc0NzYtOTMyd84AAyEx

github-slug-action vulnerable to arbitrary code execution


This action uses the github.head_ref parameter in an insecure way.

This vulnerability can be triggered by any user on GitHub on any workflow using the action on pull requests. They just need to create a pull request with a branch name, which can contain the attack payload. (Note that first-time PR requests will not be run - but the attacker can submit a valid PR before submitting an invalid PR). This can be used to execute code on the GitHub runners (potentially use it for crypto-mining, and waste your resources) and to exfiltrate any secrets you use in the CI pipeline.


Pass the variable as an environment variable and then use the environment variable instead of substituting it directly.

Patched action is available on tag v4, tag v4.4.1, and any tag beyond.


No workaround is available if impacted, please upgrade the version

ℹ️ v3 and v4 are compatibles.


Here is a set of blog posts by Github's security team explaining this issue.


Thanks to the team of researchers from Purdue University, who are working on finding vulnerabilities in CI/CD configurations of open-source software. Their tool detected this security vulnerability.

Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: about 1 year ago
Updated: 6 days ago

CVSS Score: 8.8
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Identifiers: GHSA-6q4m-7476-932w, CVE-2023-27581
References: Repository:
Blast Radius: 1.0

Affected Packages

Affected Version Ranges: >= 4.0.0, < 4.4.1
Fixed in: 4.4.1