Unsafe deserialization vulnerability in SnakeYaml (CVE-2022-1471)

CVE-2022-1471 affects SnakeYAML, a widely used Java YAML 1.1 parser included indirectly in many Spring Boot applications, by allowing unsafe deserialization that may result in arbitrary code execution. Its default `Yaml.load()` behavior can instantiate arbitrary classes found on an application’s classpath before an expected type cast occurs, enabling attackers who control YAML input to trigger malicious “gadget” classes or chains, including mechanisms involving JDK classes, remote URLs, LDAP lookups, or reverse shells. Actual exposure depends largely on whether applications deserialize YAML from untrusted sources; framework-managed configuration files are generally less concerning unless attackers can modify them. At the time discussed, maintainers had accepted a proposed blocklist for a future 1.34 release but no comprehensive change to the default behavior, while documentation advised against using `Yaml.load()` on untrusted input and recommended safer constructors. The discussion also emphasizes dependency vulnerability scanning because third-party libraries can introduce exploitable classes and known security flaws.

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