CVE-2025-31133

CVE-2025-31133 is a high-severity vulnerability affecting runc versions 1.2.7 and below, 1.3.0-rc.1 through 1.3.1, and 1.4.0-rc.1 through 1.4.0-rc.2. The flaw stems from insufficient validation of bind-mount sources for /dev/null, enabling arbitrary mount gadgets. This can lead to host information disclosure, denial of service, container escape, or bypassing of maskedPaths, with a CVSS score of 7.8 (High) due to its low attack complexity and high impact on confidentiality, integrity, and availability. While there is no known active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion and media coverage, indicating high awareness and potential for future exploitation.