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CVE-2026-44359 is a critical CI/CD supply-chain vulnerability in the Meshtastic GitHub repository affecting versions prior to 2.7.21.1370b23. The flaw resides in the main_matrix.yml GitHub Actions workflow, which is triggered by pull_request_target and then, in multiple jobs including check, build, and build-debian-src, checks out and executes code from an external contributor's fork. Because pull_request_target runs in the security context of the target repository, the attacker-controlled code executes with access to repository secrets and elevated GITHUB_TOKEN permissions. The workflow lacked an approval gate for untrusted external pull requests, including those from users with no prior repository trust relationship. This created a condition where arbitrary code from an attacker-controlled fork could run directly in CI with privileged repository context, enabling compromise of the build pipeline and repository environment.
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Cross-references every affected SKU, including bundled OEM variants.
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