## SummaryA potential Denial of Service issue in protobuf-java was discovered in the parsing procedure for binary data.Reporter: [OSS-Fuzz](https://github.com/google/oss-fuzz)Affected versions: All versions of Java Protobufs (including Kotlin and JRuby) prior to the versions listed below. Protobuf "javalite" users (typically Android) are not affected.## Severity[CVE-2021-22569](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-22569) **High** - CVSS Score: 7.5, An implementation weakness in how unknown fields are parsed in Java. A small (~800 KB) malicious payload can occupy the parser for several minutes by creating large numbers of short-lived objects that cause frequent, repeated GC pauses.## Proof of ConceptFor reproduction details, please refer to the oss-fuzz issue that identifies the specific inputs that exercise this parsing weakness.## Remediation and MitigationPlease update to the latest available versions of the following packages:- protobuf-java (3.16.1, 3.18.2, 3.19.2) - protobuf-kotlin (3.18.2, 3.19.2)- google-protobuf [JRuby gem only] (3.19.2)