Beta9 Vulnerabilities Enable Host Filesystem Exposure and Container Escape
Article Content
- •Beta9 has critical vulnerabilities CVE-2026-120308 and CVE-2026-120307.
- •Both flaws allow unauthorized access to host files and potential container escape.
- •Patches were released on September 15, 2026; users must upgrade to avoid risks.
Beta9 has been found vulnerable to two significant security flaws: CVE-2026-120308 allows host filesystem exposure via volume path traversal, while CVE-2026-120307 enables container escape through unvalidated sandbox file paths. Both vulnerabilities affect tenants deploying functions or tasks on Beta9, allowing unauthorized access to the host system's filesystem and potentially sensitive files of other tenants. The flaws arise from improper validation of volume identifiers and sandbox file paths, which can lead to reading and writing files outside the intended container environment. The vulnerabilities were disclosed on November 1, 2026, with patches released on September 15, 2026, for affected versions 0.1.745 and earlier. Users are advised to upgrade to gateway version 0.1.776 and worker version 0.1.756 or later to mitigate these risks. The vulnerabilities have not been reported as in the wild.
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